diff --git a/256colors.jpg b/256colors.jpg
new file mode 100755
index 0000000..2930534
Binary files /dev/null and b/256colors.jpg differ
diff --git a/example/ask.c b/example/ask.c
index d84d242..d694605 100644
--- a/example/ask.c
+++ b/example/ask.c
@@ -3,12 +3,6 @@
 
 #include "tim.h"
 
-// colors
-#define CTXT 0xf     // text   black, white
-#define CFR  0x8     // frame  black, gray
-#define CYES 0xa000f // yes    green, black, white
-#define CNO  0x9000f // no     red, black  white
-
 i32 main(i32 argc, char** argv) {
     if (argc < 2 || strcmp(argv[1], "-h") == 0) {
         printf("syntax: %s message\n", argv[0]);
@@ -18,6 +12,11 @@ i32 main(i32 argc, char** argv) {
     // get text properties
     TimText msg = tim_scan_str(argv[1]);
 
+    TimStyle style_frame = { .brd = TimColor16_DarkGray };
+    TimStyle style_text = { .fg = TimColor16_White };
+    TimStyle style_yes = { .brd = TimColor16_Green, .fg = style_text.fg };
+    TimStyle style_no = { .brd = TimColor16_Red, .fg = style_yes.fg };
+
     while (tim_run(0)) {
         // calculate size of message box
         i32 w = MAX(msg.width + 4, 28);
@@ -25,18 +24,18 @@ i32 main(i32 argc, char** argv) {
 
         tim_scope(A, A, w, h) {
             // draw frame around entire scope
-            tim_frame(0, 0, ~0, ~0, CFR);
+            tim_frame(0, 0, ~0, ~0, style_frame);
 
             // draw message
-            tim_label(argv[1], A, 1, msg.width, msg.lines, CTXT);
+            tim_label(argv[1], A, 1, msg.width, msg.lines, style_text);
 
             // draw 'yes' button, return 0 when clicked
-            if (tim_button("[y] Yes", 2, ~1, A, A, CYES) || tim_is_key_press('y')) {
+            if (tim_button("[y] Yes", 2, ~1, A, A, style_yes) || tim_is_key_press('y')) {
                 exit(0);
             }
 
             // draw 'no' button, return 1 when clicked
-            if (tim_button("[n] No", ~2, ~1, A, A, CNO) || tim_is_key_press('n')) {
+            if (tim_button("[n] No", ~2, ~1, A, A, style_no) || tim_is_key_press('n')) {
                 exit(1);
             }
 
@@ -46,4 +45,5 @@ i32 main(i32 argc, char** argv) {
             }
         }
     }
+    return 0;
 }
diff --git a/example/hello.c b/example/hello.c
index 328de35..fae35ab 100644
--- a/example/hello.c
+++ b/example/hello.c
@@ -1,15 +1,20 @@
 #include "tim.h"
 
 i32 main(void) {
-    while (tim_run(0)) {                        // init state and start event loop
-        tim_scope(A, A, 24, 8) {                // centered 24x8 scope
-            u64 c = 0x0a060f;                   // three colors
-            tim_frame(0, 0, ~0, ~0, c);         // draw frame for scope
+    while (tim_run(0)) {                            // init state and start event loop
+        tim_scope(A, A, 24, 8) {                    // centered 24x8 scope
+            TimStyle c = {                          // three colors
+                .brd= TimColor16_Green,     
+                .bg = TimColor16_DarkCyan, 
+                .fg = TimColor16_White 
+            };
+            tim_frame(0, 0, ~0, ~0, c);             // draw frame for scope
             tim_label("Greetings!", A, 2, A, A, c); // label in top center
             if (tim_button("OK", A, ~1, 8, A, c))   // button in bottom center
-                return 0;                       // exit on button click
-            if (tim_is_key_press('q'))          // ctrl-c is masked
-                return 0;                       // exit on 'q' press
+                return 0;                           // exit on button click
+            if (tim_is_key_press('q'))              // ctrl-c is masked
+                return 0;                           // exit on 'q' press
         }
-    }                                           // atexit() cleanup
+    }                                               // atexit() cleanup
+    return 0;
 }
diff --git a/example/snek.c b/example/snek.c
index 278be84..81f86af 100644
--- a/example/snek.c
+++ b/example/snek.c
@@ -6,7 +6,6 @@
 
 #define FG  0x10
 #define BG  0xdd
-#define BTN (FG << 16 | BG << 8 | FG)
 
 #define NEW   0
 #define RUN   1
@@ -81,7 +80,7 @@ static void game(void) {
     }
 
     // user input
-    if (tim->event.type == KEY_EVENT) {
+    if (tim->event.type == TimEvent_Key) {
         i32 key = tim->event.key;
         if ((key == TimKey_Right || key == 'd') && snek.look.x != -1) {
             snek.look = (point){{1, 0}};
@@ -99,17 +98,18 @@ static void game(void) {
 }
 
 static void menu(void) {
+    TimStyle style_button = (TimStyle){ .brd= FG, .bg = BG, .fg = FG };
     tim_scope(A, A, 20, 13) {
         char* lbl = snek.state == OVER ? "GAME OVER" : "SNEK - THE GAME";
         char* btn = snek.state == PAUSE ? "Resume" : "Play";
-        tim_label(lbl, A, 0, A, A, BTN);
-        if (tim_button(btn, A, 2, 20, 5, BTN) || tim_is_key_press(TimKey_Enter)) {
+        tim_label(lbl, A, 0, A, A, style_button);
+        if (tim_button(btn, A, 2, 20, 5, style_button) || tim_is_key_press(TimKey_Enter)) {
             if (snek.state != PAUSE) {
                 start();
             }
             snek.state = RUN;
         }
-        if (tim_button("Exit", A, 8, 20, 5, BTN) || tim_is_key_press('q') || tim_is_key_press(TimKey_Escape)) {
+        if (tim_button("Exit", A, 8, 20, 5, style_button) || tim_is_key_press('q') || tim_is_key_press(TimKey_Escape)) {
             exit(0);
         }
     }
@@ -126,6 +126,6 @@ i32 main(void) {
         } else {
             menu();
         }
-
     }
+    return 0;
 }
diff --git a/include/tim.h b/include/tim.h
index 0bc3c71..a1f9b5e 100644
--- a/include/tim.h
+++ b/include/tim.h
@@ -60,42 +60,42 @@ extern "C" {
 #pragma region constants
 
 #define TIM_ENABLE_DBUF 1               // double buffering
-#define TIM_MAX_SCOPE   20              // max scope nesting
+#define TIM_MAX_SCOPE   32              // max scope nesting
 #define TIM_MAX_CELLS   0x20000         // size of screen buffer
 #define TIM_MAX_BUF     (TIM_MAX_CELLS * 4) // size of output buffer
 #define A               INT_MAX         // auto center / width / height
 
-typedef enum TimEventType {
-    TimEvent_Void,  // an event was consumed
-    TimEvent_Draw,  // draw screen
-    TimEvent_Key,   // a key was pressed
-    TimEvent_Mouse, // mouse button, scroll or move
-} TimEventType;
-
-enum {
-    TimKey_MouseButtonLeft  = 1,
-    TimKey_Backspace        = 8,
-    TimKey_Tab              = 9,
-    TimKey_Enter            = 13,
-    TimKey_Escape           = 27,
-    TimKey_Insert           = -1,
-    TimKey_Delete           = -2,
-    TimKey_Home             = -3,
-    TimKey_End              = -4,
-    TimKey_PageUp           = -5,
-    TimKey_PageDown         = -6,
-    TimKey_Up               = -7,
-    TimKey_Down             = -8,
-    TimKey_Left             = -9,
-    TimKey_Right            = -10,
-};
-// key code or 32-bit unicode char
-typedef i32 TimKey;
-
 #pragma endregion
 
 #pragma region types
 
+
+/* first 16 colors from xterm256 supported by any terminal emulator */
+enum {
+    TimColor16_Black       = 0x00,
+    TimColor16_DarkRed     = 0x01,
+    TimColor16_DarkGreen   = 0x02,
+    TimColor16_DarkYellow  = 0x03,
+    TimColor16_DarkBlue    = 0x04,
+    TimColor16_DarkMagenta = 0x05,
+    TimColor16_DarkCyan    = 0x06,
+    TimColor16_Gray        = 0x07,
+    TimColor16_DarkGray    = 0x08,
+    TimColor16_Red         = 0x09,
+    TimColor16_Green       = 0x0a,
+    TimColor16_Yellow      = 0x0b,
+    TimColor16_Blue        = 0x0c,
+    TimColor16_Magenta     = 0x0d,
+    TimColor16_Cyan        = 0x0e,
+    TimColor16_White       = 0x0f,
+};
+
+typedef struct TimStyle {
+    u8 brd; // border
+    u8 bg;  // background
+    u8 fg;  // foreground
+} TimStyle;
+
 typedef struct TimCell {
     u8 fg;     // foreground color
     u8 bg;     // background color
@@ -124,6 +124,33 @@ typedef struct TimLine {
     i32 width;  // line width in glyph
 } TimLine;
 
+typedef enum TimEventType {
+    TimEvent_Void,  // an event was consumed
+    TimEvent_Draw,  // draw screen
+    TimEvent_Key,   // a key was pressed
+    TimEvent_Mouse, // mouse button, scroll or move
+} TimEventType;
+
+enum {
+    TimKey_MouseButtonLeft  = 1,
+    TimKey_Backspace        = 8,
+    TimKey_Tab              = 9,
+    TimKey_Enter            = 13,
+    TimKey_Escape           = 27,
+    TimKey_Insert           = -1,
+    TimKey_Delete           = -2,
+    TimKey_Home             = -3,
+    TimKey_End              = -4,
+    TimKey_PageUp           = -5,
+    TimKey_PageDown         = -6,
+    TimKey_Up               = -7,
+    TimKey_Down             = -8,
+    TimKey_Left             = -9,
+    TimKey_Right            = -10,
+};
+// key code or 32-bit unicode char
+typedef i32 TimKey;
+
 typedef struct TimEvent {
     TimEventType type;
     TimKey key;         // used by TimEvent_Key and TimEvent_Mouse
@@ -133,9 +160,9 @@ typedef struct TimEvent {
 } TimEvent;
 
 typedef struct TimEditState {
-    i32  cursor;    // cursor position (utf8)
-    i32  length;    // string length (utf8)
-    i32 capacity;   // buffer size
+    i32 cursor;     // cursor position (utf8)
+    i32 length;     // string length (utf8)
+    i32 capacity;   // buffer size in bytes
     char* s;        // zero terminated buffer
 } TimEditState;
 
@@ -195,9 +222,17 @@ i64 tim_time_usec(void);
 
 #pragma region scope
 
+// for some stupid reason gcc requires more than 3 levels of macros to concat _i_ with line number
+#define _tim_cat2(A, B) A##B
+#define _tim_scope_line(L) _tim_cat2(_i_, L)
+#define _tim_scope_i _tim_scope_line(__LINE__)
+
 // enter layout scope
-#define tim_scope(x, y, w, h) \
-    for (i32 _i = tim_enter_scope((x), (y), (w), (h)); _i; _i = tim_exit_scope())
+#define tim_scope(x, y, w, h) for (\
+        i32 _tim_scope_i = tim_enter_scope((x), (y), (w), (h)); \
+        _tim_scope_i;\
+        _tim_scope_i = tim_exit_scope()\
+    ) /* here goes your { code } */
 
 // convert relative (scoped) to absolute (screen) coordinates
 TimRect tim_scope_rect_to_absolute(i32 x, i32 y, i32 w, i32 h);
@@ -217,35 +252,35 @@ i32 tim_exit_scope(void);
 
 // frame
 // color: background, frame
-void tim_frame(i32 x, i32 y, i32 w, i32 h, u64 color);
+void tim_frame(i32 x, i32 y, i32 w, i32 h, TimStyle style);
 
 // text label
 // str  : text - supports multiple lines
 // color: background, text
-void tim_label(cstr s, i32 x, i32 y, i32 w, i32 h, u64 color);
+void tim_label(cstr s, i32 x, i32 y, i32 w, i32 h, TimStyle style);
 
 // button - returns true on click
 // color: frame, background, text
-bool tim_button(cstr txt, i32 x, i32 y, i32 w, i32 h, u64 color);
+bool tim_button(cstr txt, i32 x, i32 y, i32 w, i32 h, TimStyle style);
 
 // check box - returns true when clicked
 // txt  : text label
 // state: persistent state, 0 unchecked, -1 semi checked, !0: checked
 // color: check, background, text
-bool tim_checkbox(cstr txt, i32* state, i32 x, i32 y, i32 w, u64 color);
+bool tim_checkbox(cstr txt, i32* state, i32 x, i32 y, i32 w, TimStyle style);
 
 // radio button - return true when clicked
 // txt  : text label
 // state: persistent state, selected if *state == v
 // v    : value
 // color: radio, background, text
-bool tim_radiobutton(cstr txt, i32* state, i32 v, i32 x, i32 y, i32 w, u64 color);
+bool tim_radiobutton(cstr txt, i32* state, i32 v, i32 x, i32 y, i32 w, TimStyle style);
 
 /// text edit - value in state
 /// @param e persistent edit state, use TimEditState_init() to create new state
 /// @param color frame, background, text
 /// @return key id or 0
-TimKey tim_edit(TimEditState* e, i32 x, i32 y, i32 w, u64 color);
+TimKey tim_edit(TimEditState* e, i32 x, i32 y, i32 w, TimStyle style);
 
 void TimEditState_init(TimEditState* e, i32 capacity, cstr initial_content);
 
diff --git a/project.config b/project.config
index a8cc118..d650b0f 100644
--- a/project.config
+++ b/project.config
@@ -38,17 +38,19 @@ STATIC_LIB_FILE="$PROJECT.a"
 # example: "-I./include -I$DEPENDENCIES_DIR/libexample"
 INCLUDE="-Iinclude -Isrc"
 
+EXEC_FILE=""
+EXEC_EXT=""
+
 # OS-specific options
 case "$OS" in
     WINDOWS)
-        EXEC_FILE="snek.exe"
+        EXEC_EXT=".exe"
         SHARED_LIB_FILE="$PROJECT.dll"
         INCLUDE="$INCLUDE "
         # example: "-lSDL2 -lSDL2_image"
         LINKER_LIBS=""
         ;;
     LINUX)
-        EXEC_FILE="snek"
         SHARED_LIB_FILE="$PROJECT.so"
         INCLUDE="$INCLUDE "
         LINKER_LIBS=""
@@ -60,26 +62,72 @@ esac
 
 # TASKS
 case "$TASK" in
-    # creates executable using profiling info if it exists
-    build_exec)
-        SRC_C="$SRC_C example/snek.c"
-        # -flto applies more optimizations across object files
-        # -flto=auto is needed to multithreaded copilation
-        # -fuse-linker-plugin is required to use static libs with lto
-        # -fprofile-use enables compiler to use profiling info files to optimize executable
-        # -fprofile-prefix-path sets path where profiling info about objects are be saved
-        # -fdata-sections -ffunction-sections -Wl,--gc-sections  removes unused code
-        C_ARGS="-O2 -flto=auto -fuse-linker-plugin -fprofile-use -fprofile-prefix-path=$(realpath $OBJDIR)/objects -fdata-sections -ffunction-sections -Wl,--gc-sections"
+    # ./ask question?
+    ask)
+        EXEC_FILE="ask$EXEC_EXT"
+        SRC_C="example/ask.c"
+        LINKER_LIBS="bin/tim.a"
+        C_ARGS="-O0 -g"
         CPP_ARGS="$C_ARGS"
         LINKER_ARGS="$CPP_ARGS $LINKER_LIBS"
         PRE_TASK_SCRIPT=""
         TASK_SCRIPT="@cbuild/default_tasks/build_exec.sh"
-        POST_TASK_SCRIPT="@cbuild/default_tasks/strip_exec.sh"
+        POST_TASK_SCRIPT=""
         ;;
-    # creates executable with debug info and no optimizations
-    build_exec_dbg)
-        SRC_C="$SRC_C example/snek.c"
-        C_ARGS="-O0 -g3"
+    # hello world
+    hello)
+        EXEC_FILE="hello$EXEC_EXT"
+        SRC_C="example/hello.c"
+        LINKER_LIBS="bin/tim.a"
+        C_ARGS="-O0 -g"
+        CPP_ARGS="$C_ARGS"
+        LINKER_ARGS="$CPP_ARGS $LINKER_LIBS"
+        PRE_TASK_SCRIPT=""
+        TASK_SCRIPT="@cbuild/default_tasks/build_exec.sh"
+        POST_TASK_SCRIPT=""
+        ;;
+    # snake game
+    snek)
+        EXEC_FILE="snek$EXEC_EXT"
+        SRC_C="example/snek.c"
+        LINKER_LIBS="bin/tim.a"
+        C_ARGS="-O0 -g"
+        CPP_ARGS="$C_ARGS"
+        LINKER_ARGS="$CPP_ARGS $LINKER_LIBS"
+        PRE_TASK_SCRIPT=""
+        TASK_SCRIPT="@cbuild/default_tasks/build_exec.sh"
+        POST_TASK_SCRIPT=""
+        ;;
+    # test
+    test)
+        EXEC_FILE="test$EXEC_EXT"
+        SRC_C="test/test.c"
+        LINKER_LIBS="bin/tim.a"
+        C_ARGS="-O0 -g"
+        CPP_ARGS="$C_ARGS"
+        LINKER_ARGS="$CPP_ARGS $LINKER_LIBS"
+        PRE_TASK_SCRIPT=""
+        TASK_SCRIPT="@cbuild/default_tasks/build_exec.sh"
+        POST_TASK_SCRIPT=""
+        ;;
+    # color
+    color)
+        EXEC_FILE="color$EXEC_EXT"
+        SRC_C="test/color.c"
+        LINKER_LIBS="bin/tim.a"
+        C_ARGS="-O0 -g"
+        CPP_ARGS="$C_ARGS"
+        LINKER_ARGS="$CPP_ARGS $LINKER_LIBS"
+        PRE_TASK_SCRIPT=""
+        TASK_SCRIPT="@cbuild/default_tasks/build_exec.sh"
+        POST_TASK_SCRIPT=""
+        ;;
+    # string
+    string)
+        EXEC_FILE="string$EXEC_EXT"
+        SRC_C="test/string.c"
+        LINKER_LIBS="bin/tim.a"
+        C_ARGS="-O0 -g"
         CPP_ARGS="$C_ARGS"
         LINKER_ARGS="$CPP_ARGS $LINKER_LIBS"
         PRE_TASK_SCRIPT=""
diff --git a/readme.md b/readme.md
index 80cdee7..1457d0b 100644
--- a/readme.md
+++ b/readme.md
@@ -5,6 +5,26 @@ Fork of https://codeberg.org/chuvok/tim.h
 tim is a portable library to create simple terminal applications
 Demo video: https://asciinema.org/a/zn3p0dsVCOQOzwY1S9gDfyaxQ
 
+## build
+1. Clone this repository.
+    ```
+    git clone https://timerix.ddns.net/git/Timerix/tim.git
+    ```
+
+2. Install [cbuild](https://timerix.ddns.net/git/Timerix/cbuild/releases). 
+    Select latest version compatible with the one in `project.config`.
+    Example: For `2.3.2` download latest `2.3.x`.
+
+3. Build static library
+    ```
+    cd tim
+    cbuild build_static_lib
+    ```
+4. Build tests and examples
+    ```
+    cbuild ask hello snek test color string
+    ```
+
 ## quick start 
 See [example/hello.c](./example/hello.c)
 
@@ -44,18 +64,10 @@ take the full available space from parent.
 The layout automatically adopts to terminal window resize events.
 
 ## colors
-Most elements have a uint64 color argument which holds up to eight colors.
-Typically byte 0 is the text color and byte 1 is the background color.
-
-For example 0x08040f encodes three colors. When used with a button the text
-is white (0f), the background is blue (04), and the frame is gray (08).
-
-The terminal should support xterm-256 colors. The TERM variable is ignored.
-The lower 16 colors vary across different terminals, so the upper 240 colors
-should be used if consistency is important.
-
-xterm-256 color chart
-https://upload.wikimedia.org/wikipedia/commons/1/15/Xterm_256color_chart.svg
+Colors are stored as 8-bit values.
+Most terminals support 16 basic colors. You can see them in TimColor16 enum.
+There is also support for xterm-256 colors.
+![xterm-256 color chart](./256colors.jpg)
 
 ## events
 tim_run blocks until it observes an event. Mouse and key events are always
@@ -66,20 +78,13 @@ event when focused in order to prevent other key handlers on acting on them.
 
 The current event is stored in tim->event.
 
- event       | cause
--------------|-----------------------
- DRAW_EVENT  | input, timeout, resize
- KEY_EVENT   | key press
- MOUSE_EVENT | mouse click
- VOID_EVENT  | consumed event
-
 ## elements
 frame (x, y, w, h, color)
 
     Draw an empty frame and fill area.
 
     x/y/w/h see layout documentation
-    color   background, frame
+    style   background, frame
 
 label (str, x, y, w, h, color)
 
@@ -88,7 +93,7 @@ label (str, x, y, w, h, color)
 
     str     zero terminated string
     x/y/w/h see layout documentation
-    color   background, text
+    style   background, text
 
 button (str, x, y, w, h, color) -> bool
 
@@ -97,7 +102,7 @@ button (str, x, y, w, h, color) -> bool
 
     str     zero terminated string
     x/y/w/h see layout documentation
-    color   frame, background, text
+    style   frame, background, text
 
 edit (state, x, y, w, color) -> int
 
@@ -108,7 +113,7 @@ edit (state, x, y, w, color) -> int
 
     state   pointer to persistent edit state struct
     x/y/w   see layout documentation
-    color   f   rame, background, text
+    style   f   rame, background, text
 
 check (str, state, x, y, w, color) -> bool
 
@@ -119,7 +124,7 @@ check (str, state, x, y, w, color) -> bool
     str     zero terminated string
     state   pointer to persistent state variable
     x/y/w   see layout documentation
-    color   check, background, text
+    style   check, background, text
 
 radio (str, state, v, x, y, w, color) -> bool
 
@@ -131,7 +136,7 @@ radio (str, state, v, x, y, w, color) -> bool
     state   pointer to persistent state variable
     v       unique state value
     x/y/w   see layout documentation
-    color   radio, background, text
+    style   radio, background, text
 
 ## functions 
 tim_run (fps) -> bool
diff --git a/src/edit.c b/src/edit.c
index 7b0a8a1..b366443 100755
--- a/src/edit.c
+++ b/src/edit.c
@@ -85,18 +85,18 @@ static TimKey edit_event(TimEditState* e, TimRect r) {
     return tim->event.key;
 }
 
-TimKey tim_edit(TimEditState* e, i32 x, i32 y, i32 w, u64 color) {
+TimKey tim_edit(TimEditState* e, i32 x, i32 y, i32 w, TimStyle style) {
     TimRect r = tim_scope_rect_to_absolute(x, y, w, 3);
 
     if (tim->event.type == TimEvent_Draw) {
-        tim_draw_box(r.x, r.y, r.w, r.h, color >> 16, color >> 8);
+        tim_draw_box(r.x, r.y, r.w, r.h, style.brd, style.bg);
         if (tim->focus == e) {
             char* s = e->s + tim_utf8_pos(e->s, e->cursor - r.w + 4);
             i32   cur = MIN(r.w - 4, e->cursor);
-            tim_draw_str(s, r.x + 2, r.y + 1, r.w - 3, color, color >> 8);
+            tim_draw_str(s, r.x + 2, r.y + 1, r.w - 3, style.fg, style.bg);
             tim_draw_invert(r.x + cur + 2, r.y + 1, 1);
         } else {
-            tim_draw_str(e->s, r.x + 2, r.y + 1, r.w - 3, color, color >> 8);
+            tim_draw_str(e->s, r.x + 2, r.y + 1, r.w - 3, style.fg, style.bg);
         }
     }
 
diff --git a/src/widgets.c b/src/widgets.c
index eacb1ff..c695ab5 100755
--- a/src/widgets.c
+++ b/src/widgets.c
@@ -1,19 +1,19 @@
 #include "tim.h"
 
-void tim_frame(i32 x, i32 y, i32 w, i32 h, u64 color) {
+void tim_frame(i32 x, i32 y, i32 w, i32 h, TimStyle style) {
     if (tim->event.type == TimEvent_Draw) {
         TimRect r = tim_scope_rect_to_absolute(x, y, w, h);
-        tim_draw_box(r.x, r.y, r.w, r.h, color, color >> 8);
+        tim_draw_box(r.x, r.y, r.w, r.h, style.brd, style.bg);
     }
 }
 
-void tim_label(cstr s, i32 x, i32 y, i32 w, i32 h, u64 color) {
+void tim_label(cstr s, i32 x, i32 y, i32 w, i32 h, TimStyle style) {
     if (tim->event.type == TimEvent_Draw) {
         TimText t = tim_scan_str(s);
         w = (w == A) ? t.width : w;
         h = (h == A) ? t.lines : h;
         TimRect r = tim_scope_rect_to_absolute(x, y, w, h);
-        TimCell c = tim_cell(" ", color, color >> 8);
+        TimCell c = tim_cell(" ", style.fg, style.bg);
         tim_draw_lot(c, r.x, r.y, r.w, r.h);
         TimLine l = {.s = s, .line = ""};
         for (i32 i = 0; tim_next_line(&l); i++) {
@@ -22,28 +22,28 @@ void tim_label(cstr s, i32 x, i32 y, i32 w, i32 h, u64 color) {
     }
 }
 
-bool tim_button(cstr txt, i32 x, i32 y, i32 w, i32 h, u64 color) {
+bool tim_button(cstr txt, i32 x, i32 y, i32 w, i32 h, TimStyle style) {
     i32 tw = tim_utf8_len(txt);
     w      = (w == A) ? (tw + 4) : w;
     h      = (h == A) ? 3 : h;
     TimRect r = tim_scope_rect_to_absolute(x, y, w, h);
 
     if (tim->event.type == TimEvent_Draw) {
-        tim_draw_box(r.x, r.y, r.w, r.h, color >> 16, color >> 8);
-        tim_draw_str(txt, r.x + (w - tw) / 2, r.y + h / 2, w, color, color >> 8);
+        tim_draw_box(r.x, r.y, r.w, r.h, style.brd, style.bg);
+        tim_draw_str(txt, r.x + (w - tw) / 2, r.y + h / 2, w, style.fg, style.bg);
     }
     return tim_is_mouse_click_over(r);
 }
 
-bool tim_checkbox(cstr txt, i32* state, i32 x, i32 y, i32 w, u64 color) {
+bool tim_checkbox(cstr txt, i32* state, i32 x, i32 y, i32 w, TimStyle style) {
     w = (w == A) ? tim_utf8_len(txt) + 4 : w;
     TimRect r = tim_scope_rect_to_absolute(x, y, w, 1);
 
     if (tim->event.type == TimEvent_Draw) {
         cstr st = *state == -1 ? "-" : *state ? "x" : "  ";
-        tim_draw_str("[ ] ", r.x, r.y, 4, color, color >> 8);
-        tim_draw_str(st, r.x + 1, r.y, 1, color >> 16, color >> 8);
-        tim_draw_str(txt, r.x + 4, r.y, r.w - 4, color, color >> 8);
+        tim_draw_str("[ ] ", r.x, r.y, 4, style.fg, style.bg);
+        tim_draw_str(st, r.x + 1, r.y, 1, style.brd, style.bg);
+        tim_draw_str(txt, r.x + 4, r.y, r.w - 4, style.fg, style.bg);
     }
 
     bool click = tim_is_mouse_click_over(r);
@@ -52,15 +52,15 @@ bool tim_checkbox(cstr txt, i32* state, i32 x, i32 y, i32 w, u64 color) {
 }
 
 
-bool tim_radiobutton(cstr txt, i32* state, i32 v, i32 x, i32 y, i32 w, u64 color) {
+bool tim_radiobutton(cstr txt, i32* state, i32 v, i32 x, i32 y, i32 w, TimStyle style) {
     w = (w == A) ? tim_utf8_len(txt) + 4 : w;
     TimRect r = tim_scope_rect_to_absolute(x, y, w, 1);
 
     if (tim->event.type == TimEvent_Draw) {
         cstr st = *state == v ? "o" : " ";
-        tim_draw_str("( ) ", r.x, r.y, 4, color, color >> 8);
-        tim_draw_str(st, r.x + 1, r.y, 1, color >> 16, color >> 8);
-        tim_draw_str(txt, r.x + 4, r.y, r.w - 4, color, color >> 8);
+        tim_draw_str("( ) ", r.x, r.y, 4, style.fg, style.bg);
+        tim_draw_str(st, r.x + 1, r.y, 1, style.brd, style.bg);
+        tim_draw_str(txt, r.x + 4, r.y, r.w - 4, style.fg, style.bg);
     }
 
     bool click = tim_is_mouse_click_over(r);
diff --git a/test/color.c b/test/color.c
index 17f8a66..9ff280d 100644
--- a/test/color.c
+++ b/test/color.c
@@ -26,4 +26,5 @@ i32 main(void) {
             exit(1);
         }
     }
+    return 0;
 }
diff --git a/test/string.c b/test/string.c
index 6a94b25..5ada96f 100644
--- a/test/string.c
+++ b/test/string.c
@@ -67,4 +67,5 @@ i32 main(void) {
     TEST(tim_utf8_is_wide_perhaps(U("┌"))  == false);
     TEST(tim_utf8_is_wide_perhaps(U("한"))  == true);
     TEST(tim_utf8_is_wide_perhaps(U("𐍈"))  == true);
+    return 0;
 }
diff --git a/test/test.c b/test/test.c
index 33f0a8d..60bef7a 100644
--- a/test/test.c
+++ b/test/test.c
@@ -1,120 +1,128 @@
 #include "tim.h"
 
-static inline void test_screen(TimEvent* e) {
-    static TimEvent me;
-    static TimEvent ke;
-    static i32          render_us;
-    char                buf[64];
+static TimEditState ed1;
+static TimEditState ed2;
 
-    ke = (e->type == KEY_EVENT)   ? *e : ke;
-    me = (e->type == MOUSE_EVENT) ? *e : me;
+static inline void test_screen(TimEvent* e) {
+    static TimEvent me = {0};
+    static TimEvent ke = {0};
+    static i32 render_us = 0;
+    char buf[64] = {0};
+
+    if(e->type == TimEvent_Key)
+        ke = *e;
+    if(e->type == TimEvent_Mouse)
+        me = *e;
 
     // positioning
-    tim_label("+",  0,  0, A, A, 0xf);
-    tim_label("+", ~0,  0, A, A, 0xf);
-    tim_label("+",  0, ~0, A, A, 0xf);
-    tim_label("+", ~0, ~0, A, A, 0xf);
-    tim_label("+",  A,  A, A, A, 0xf);
-    tim_label("-",  0,  A, A, A, 0xf);
-    tim_label("-", ~0,  A, A, A, 0xf);
-    tim_label("|",  A,  0, A, A, 0xf);
-    tim_label("|",  A, ~0, A, A, 0xf);
+    static TimStyle style_default = { .fg = TimColor16_White };
+    tim_label("+",  0,  0, A, A, style_default);
+    tim_label("+", ~0,  0, A, A, style_default);
+    tim_label("+",  0, ~0, A, A, style_default);
+    tim_label("+", ~0, ~0, A, A, style_default);
+    tim_label("+",  A,  A, A, A, style_default);
+    tim_label("-",  0,  A, A, A, style_default);
+    tim_label("-", ~0,  A, A, A, style_default);
+    tim_label("|",  A,  0, A, A, style_default);
+    tim_label("|",  A, ~0, A, A, style_default);
 
     // some information
     sprintf(buf, "screen: %dx%d", tim->w, tim->h);
-    tim_label(buf, 2, 0, A, A, 0xf);
+    tim_label(buf, 2, 0, A, A, style_default);
     sprintf(buf, "frame : [%c] %d",  ": "[tim->frame & 1], tim->frame);
-    tim_label(buf, 2, 1, A, A, 0xf);
+    tim_label(buf, 2, 1, A, A, style_default);
     sprintf(buf, "key   : [%d] %s", ke.key, ke.s + (ke.key < 32));
-    tim_label(buf, 2, 2, A, A, 0xf);
+    tim_label(buf, 2, 2, A, A, style_default);
     sprintf(buf, "mouse : [%d] %d:%d", me.key, me.x, me.y);
-    tim_label(buf, 2, 3, A, A, 0xf);
+    tim_label(buf, 2, 3, A, A, style_default);
     sprintf(buf, "input : %02hhx %02hhx %02hhx %02hhx %02hhx %02hhx %02hhx %02hhx",
             e->s[0], e->s[1], e->s[2], e->s[3], e->s[4], e->s[5], e->s[6], e->s[7]);
-    tim_label(buf, 2, 4, A, A, 0xf);
+    tim_label(buf, 2, 4, A, A, style_default);
 
     // lower right
     render_us += tim->render_us;
     sprintf(buf, "%d µs (Ø %d µs)", tim->render_us, render_us / MAX(tim->frame, 1));
-    tim_label(buf, ~2, ~2, A, A, 0xf);
+    tim_label(buf, ~2, ~2, A, A, style_default);
     sprintf(buf, "%d cells (%.0f %%)", tim->w * tim->h, 100.0 * tim->w * tim->h / TIM_MAX_CELLS);
-    tim_label(buf, ~2, ~1, A, A, 0xf);
+    tim_label(buf, ~2, ~1, A, A, style_default);
     sprintf(buf, "%d bytes (%.0f %%)", tim->buf_size, 100.0 * tim->buf_size / TIM_MAX_BUF);
-    tim_label(buf, ~2, ~0, A, A, 0xf);
+    tim_label(buf, ~2, ~0, A, A, style_default);
 
     // multi line label
-    tim_label("multi\nliñe\nlabël", 24, 1, A, A, 0xf);
+    tim_label("multi\nliñe\nlabël", 24, 1, A, A, style_default);
 
     // colors
     tim_scope(1, 5, 16, 5) {
-        tim_frame(0, 0, ~0, ~0, 0xf);
-        tim_label(" Red   ", 1, 1, 7, A, 0x0900);
-        tim_label("       ", 8, 1, 7, A, 0xc400);
-        tim_label(" Green ", 1, 2, 7, A, 0x0a00);
-        tim_label("       ", 8, 2, 7, A, 0x2e00);
-        tim_label(" Blue  ", 1, 3, 7, A, 0x0c00);
-        tim_label("       ", 8, 3, 7, A, 0x1500);
+        tim_frame(0, 0, ~0, ~0, style_default);
+        tim_label(" Red   ", 1, 1, 7, A, (TimStyle){ .bg = 0x09 });
+        tim_label("       ", 8, 1, 7, A, (TimStyle){ .bg = 0xc4 });
+        tim_label(" Green ", 1, 2, 7, A, (TimStyle){ .bg = 0x0a });
+        tim_label("       ", 8, 2, 7, A, (TimStyle){ .bg = 0x2e });
+        tim_label(" Blue  ", 1, 3, 7, A, (TimStyle){ .bg = 0x0c });
+        tim_label("       ", 8, 3, 7, A, (TimStyle){ .bg = 0x15 });
     }
 
     // button
-    static u64 bc = 0x100;
-    if (tim_button("Click Me", 17, 5, 16, 5, bc)) {
-        bc = (bc + 0x100) & 0xff00;
+    static TimStyle style_button = { .bg = 0x01 };
+    if (tim_button("Click Me", 17, 5, 16, 5, style_button)) {
+        style_button.bg = (style_button.bg + 1) & 0xff;
     }
 
     // edit
-    static TimEditState ed1;
-    static TimEditState ed2;
-    TimEditState_init(&ed1, 32, "Edit 1");
-    TimEditState_init(&ed2, 32, "");
-    tim_edit(&ed1, 1, 10, 32, 0xff00ff);
+    static TimStyle style_edit = { .brd = 0xff, .fg = 0xff };
+    tim_edit(&ed1, 1, 10, 32, style_edit);
     sprintf(buf, "cursor: %d length: %d", ed1.cursor, ed1.length);
-    tim_label(buf, 2, 13, A, A, 0xf);
-    tim_edit(&ed2, 1, 14, 32, 0xff00ff);
-    tim_label(ed2.s, 2, 17, A, A, 0xf);
+    tim_label(buf, 2, 13, A, A, style_default);
+    tim_edit(&ed2, 1, 14, 32, style_edit);
+    tim_label(ed2.s, 2, 17, A, A, style_default);
 
     // checkbox
+    static TimStyle style_checkbox = { .brd = TimColor16_Cyan, .fg = TimColor16_White };
     static i32 chk[2] = {-1, 1};
-    tim_checkbox("Check 1", &chk[0],  1, 18, A, 0xa000f);
-    tim_checkbox("Check 2", &chk[1], 14, 18, A, 0xa000f);
+    tim_checkbox("Check 1", &chk[0],  1, 18, A, style_checkbox);
+    tim_checkbox("Check 2", &chk[1], 14, 18, A, style_checkbox);
 
     // radiobox
     static i32 rad = 0;
-    tim_radiobutton("Radio 1", &rad, 1,  1, 19, A, 0xa000f);
-    tim_radiobutton("Radio 2", &rad, 2, 14, 19, A, 0xa000f);
-    tim_radiobutton("Radio 3", &rad, 3,  1, 20, A, 0xa000f);
-    tim_radiobutton("Radio 4", &rad, 4, 14, 20, A, 0xa000f);
+    tim_radiobutton("Radio 1", &rad, 1,  1, 19, A, style_checkbox);
+    tim_radiobutton("Radio 2", &rad, 2, 14, 19, A, style_checkbox);
+    tim_radiobutton("Radio 3", &rad, 3,  1, 20, A, style_checkbox);
+    tim_radiobutton("Radio 4", &rad, 4, 14, 20, A, style_checkbox);
 
     // scope nesting
     tim_scope(~1, 1, 20, 10) {
         tim_scope(0, 0, 10, 5) {
-            tim_frame(0, 0, ~0, ~0, 0x9);
+            tim_frame(0, 0, ~0, ~0, (TimStyle){ .brd = TimColor16_Red });
         }
         tim_scope(~0, 0, 10, 5) {
-            tim_frame(0, 0, ~0, ~0, 0xa);
+            tim_frame(0, 0, ~0, ~0, (TimStyle){ .brd = TimColor16_Green });
         }
         tim_scope(~0, ~0, 10, 5) {
-            tim_frame(0, 0, ~0, ~0, 0xb);
+            tim_frame(0, 0, ~0, ~0, (TimStyle){ .brd = TimColor16_Yellow });
         }
         tim_scope(0, ~0, 10, 5) {
-            tim_frame(0, 0, ~0, ~0, 0xc);
+            tim_frame(0, 0, ~0, ~0, (TimStyle){ .brd = TimColor16_Blue });
         }
     }
 
     // funny characters
+    static TimStyle style_funny = { .bg = TimColor16_White, .fg = TimColor16_Magenta };
     tim_scope(~1, ~3, 11, 5) {
-        tim_frame(0, 0, ~0, ~0, 0xf);
-        tim_label("123456789", 1, 1, 9, A, 0x0f05);
-        tim_label("$£ह€𐍈6789", 1, 2, A, A, 0x0f05);
-        tim_label("圍棋56789", 1, 3, A, A, 0x0f05);
+        tim_frame(0, 0, ~0, ~0, style_default);
+        tim_label("123456789", 1, 1, 9, A, style_funny);
+        tim_label("$£ह€𐍈6789", 1, 2, A, A, style_funny);
+        tim_label("圍棋56789", 1, 3, A, A, style_funny);
     }
 }
 
 i32 main(void) {
+    TimEditState_init(&ed1, 32, "Edit 1");
+    TimEditState_init(&ed2, 32, "");
     while (tim_run(1.5)) {
         test_screen(&tim->event);
         if (tim_is_key_press('q') || tim_is_key_press(TimKey_Escape)) {
             break;
         }
     }
+    return 0;
 }
diff --git a/test/width.c b/test/width.c
index 2a89ebc..14ddb36 100644
--- a/test/width.c
+++ b/test/width.c
@@ -66,4 +66,5 @@ i32 main(i32 argc, char** argv) {
     tim_reset_terminal();
 
     fclose(f);
+    return 0;
 }