diff --git a/bootstrap/bloat-buster/bb_core.c b/bootstrap/bloat-buster/bb_core.c
index 6b2e5ea..192831d 100644
--- a/bootstrap/bloat-buster/bb_core.c
+++ b/bootstrap/bloat-buster/bb_core.c
@@ -10,6 +10,10 @@
 #include <std/ui_core.h>
 #include <std/ui_builder.h>
 
+#define default_font_height (64)
+auto proportional_font_height = default_font_height;
+auto monospace_font_height = default_font_height;
+
 fn TextureIndex white_texture_create(Arena* arena, Renderer* renderer)
 {
     u32 white_texture_width = 1024;
@@ -83,16 +87,18 @@ fn void app_update()
 
         if (likely(ui_build_begin(window->os, frame_ms, &state.event_queue)))
         {
-            {
-                if (unlikely(ui_button(strlit("Hello world\n")).clicked_left))
-                {
-                    print("Clicked on hello world\n");
-                }
+            ui_font_size(default_font_height);
+            ui_pref_width(ui_em(10, 1));
+            ui_pref_height(ui_em(2, 1));
 
-                if (unlikely(ui_button(strlit("Bye world\n")).clicked_left))
-                {
-                    print("Clicked on bye world\n");
-                }
+            if (unlikely(ui_button(strlit("Hello world\n")).clicked_left))
+            {
+                print("Clicked on hello world\n");
+            }
+
+            if (unlikely(ui_button(strlit("Bye world\n")).clicked_left))
+            {
+                print("Clicked on bye world\n");
             }
 
             ui_build_end();
@@ -181,7 +187,7 @@ strlit("/Users/david/Library/Fonts/FiraSans-Regular.ttf");
     auto white_texture = white_texture_create(state.arena, state.renderer);
     auto monospace_font = font_texture_atlas_create(state.arena, state.renderer, (TextureAtlasCreate) {
         .font_path = font_path,
-        .text_height = 12,
+        .text_height = monospace_font_height,
     });
     auto proportional_font = monospace_font;
 
diff --git a/bootstrap/include/std/ui_core.h b/bootstrap/include/std/ui_core.h
index dd451fd..a9a7a62 100644
--- a/bootstrap/include/std/ui_core.h
+++ b/bootstrap/include/std/ui_core.h
@@ -98,6 +98,7 @@ STRUCT(UI_Widget)
     u64 last_build_touched;
     F32Vec2 view_offset;
     Color background_color;
+    Color text_color;
 };
 decl_vbp(UI_Widget);
 
@@ -197,3 +198,9 @@ EXPORT UI_Signal ui_signal_from_widget(UI_Widget* widget);
 EXPORT UI_State* ui_state_get();
 
 EXPORT UI_Widget* ui_widget_make(UI_WidgetFlags flags, String string);
+EXPORT UI_Size ui_pixels(u32 width, f32 strictness);
+EXPORT UI_Size ui_percentage(f32 percentage, f32 strictness);
+EXPORT UI_Size ui_em(f32 value, f32 strictness);
+EXPORT void ui_pref_width(UI_Size size);
+EXPORT void ui_pref_height(UI_Size size);
+EXPORT void ui_font_size(f32 size);
diff --git a/bootstrap/std/ui_core.c b/bootstrap/std/ui_core.c
index c181d6d..b23a3a7 100644
--- a/bootstrap/std/ui_core.c
+++ b/bootstrap/std/ui_core.c
@@ -28,6 +28,16 @@ fn u8* ui_pop_generic(VirtualBuffer(u8)* stack, u32 element_size)
 #define ui_stack_pop(field_name) (typeof(ui_state->stacks.field_name.pointer)) ui_pop_generic(&ui_state->stacks.field_name, sizeof(*ui_state->stacks.field_name.pointer))
 #define ui_stack_top(field_name) (ui_state->stacks.field_name.length ? ui_state->stacks.field_name.pointer[ui_state->stacks.field_name.length - 1] : ui_state->stack_nulls.field_name)
 
+void ui_pref_width(UI_Size size)
+{
+    ui_stack_push(pref_width, size);
+}
+
+void ui_pref_height(UI_Size size)
+{
+    ui_stack_push(pref_height, size);
+}
+
 fn void ui_autopop(UI_State* state)
 {
     auto* restrict stack_end = (u32*)((u8*)&state->stacks + sizeof(state->stacks));
@@ -256,6 +266,7 @@ UI_Widget* ui_widget_make_from_key(UI_WidgetFlags flags, UI_Key key)
     auto color = count % 3 == 0;
     widget->key = key;
     widget->background_color = Color4(color, color, color, 1);
+    widget->text_color = Color4(!color, !color, !color, 1);
     widget->flags = flags;
     widget->first = 0;
     widget->last = 0;
@@ -327,8 +338,7 @@ fn void ui_stack_reset(UI_State* state)
     }
 }
 
-
-fn UI_Size ui_pixels(u32 width, f32 strictness)
+UI_Size ui_pixels(u32 width, f32 strictness)
 {
     return (UI_Size) {
         .kind = UI_SIZE_PIXEL_COUNT,
@@ -337,7 +347,7 @@ fn UI_Size ui_pixels(u32 width, f32 strictness)
     };
 }
 
-fn UI_Size ui_percentage(f32 percentage, f32 strictness)
+UI_Size ui_percentage(f32 percentage, f32 strictness)
 {
     return (UI_Size) {
         .kind = UI_SIZE_PERCENTAGE,
@@ -346,15 +356,22 @@ fn UI_Size ui_percentage(f32 percentage, f32 strictness)
     };
 }
 
-fn UI_Size ui_em(f32 value, f32 strictness)
+UI_Size ui_em(f32 value, f32 strictness)
 {
+    auto font_size = ui_stack_top(font_size);
+    assert(font_size);
     return (UI_Size) {
-        .kind = UI_SIZE_PERCENTAGE,
+        .kind = UI_SIZE_PIXEL_COUNT,
         .strictness = strictness,
-        .value = value * ui_stack_top(font_size),
+        .value = value * font_size,
     };
 }
 
+void ui_font_size(f32 size)
+{
+    ui_stack_push(font_size, size);
+}
+
 u8 ui_build_begin(OSWindow os_window, f64 frame_time, OSEventQueue* event_queue)
 {
     ui_state->build_count += 1;
@@ -713,8 +730,7 @@ void ui_draw()
 
         if (widget->flags.draw_text)
         {
-            // todo();
-            // window_render_text(renderer, window, widget->text_string, Color4(1, 1, 1, 1), RENDER_FONT_TYPE_PROPORTIONAL, widget->rect.x0, widget->rect.y0);
+            window_render_text(renderer, window, widget->text, widget->text_color, RENDER_FONT_TYPE_PROPORTIONAL, widget->rect.x0, widget->rect.y0);
         }
 
         if (widget->first)