diff --git a/src/base/base_shader.gh b/src/base/base_shader.gh
index 443a3dbb..5730680e 100644
--- a/src/base/base_shader.gh
+++ b/src/base/base_shader.gh
@@ -76,6 +76,11 @@ u32 countof(T arr[N])
 #define ClampI64(...) clamp(__VA_ARGS__)
 #define ClampF64(...) clamp(__VA_ARGS__)
 
+////////////////////////////////////////////////////////////
+//~ Derivative helpers
+
+#define fwidth_fine(v) (abs(ddx_fine((v))) + abs(ddx_fine((v))))
+
 ////////////////////////////////////////////////////////////
 //~ Color helpers
 
@@ -165,195 +170,100 @@ Vec2 NdcFromUv(Vec2 uv)
 template<typename T>
 u32 U32FromChar(in T c)
 {
-  if(c == ' ')
-  return 32;
-  if(c == '!')
-  return 33;
-  if(c == '\"' || c == '\"')
-  return 34;
-  if(c == '#')
-  return 35;
-  if(c == '$')
-  return 36;
-  if(c == '%')
-  return 37;
-  if(c == '&')
-  return 38;
-  if(c == '\'')
-  return 39;
-  if(c == '(')
-  return 40;
-  if(c == ')')
-  return 41;
-  if(c == '*')
-  return 42;
-  if(c == '+')
-  return 43;
-  if(c == ',')
-  return 44;
-  if(c == '-')
-  return 45;
-  if(c == '.')
-  return 46;
-  if(c == '/')
-  return 47;
-  if(c == '0')
-  return 48;
-  if(c == '1')
-  return 49;
-  if(c == '2')
-  return 50;
-  if(c == '3')
-  return 51;
-  if(c == '4')
-  return 52;
-  if(c == '5')
-  return 53;
-  if(c == '6')
-  return 54;
-  if(c == '7')
-  return 55;
-  if(c == '8')
-  return 56;
-  if(c == '9')
-  return 57;
-  if(c == ':')
-  return 58;
-  if(c == ';')
-  return 59;
-  if(c == '<')
-  return 60;
-  if(c == '=')
-  return 61;
-  if(c == '>')
-  return 62;
-  if(c == '?')
-  return 63;
-  if(c == '@')
-  return 64;
-  if(c == 'A')
-  return 65;
-  if(c == 'B')
-  return 66;
-  if(c == 'C')
-  return 67;
-  if(c == 'D')
-  return 68;
-  if(c == 'E')
-  return 69;
-  if(c == 'F')
-  return 70;
-  if(c == 'G')
-  return 71;
-  if(c == 'H')
-  return 72;
-  if(c == 'I')
-  return 73;
-  if(c == 'J')
-  return 74;
-  if(c == 'K')
-  return 75;
-  if(c == 'L')
-  return 76;
-  if(c == 'M')
-  return 77;
-  if(c == 'N')
-  return 78;
-  if(c == 'O')
-  return 79;
-  if(c == 'P')
-  return 80;
-  if(c == 'Q')
-  return 81;
-  if(c == 'R')
-  return 82;
-  if(c == 'S')
-  return 83;
-  if(c == 'T')
-  return 84;
-  if(c == 'U')
-  return 85;
-  if(c == 'V')
-  return 86;
-  if(c == 'W')
-  return 87;
-  if(c == 'X')
-  return 88;
-  if(c == 'Y')
-  return 89;
-  if(c == 'Z')
-  return 90;
-  if(c == '[')
-  return 91;
-  if(c == '\\')
-  return 92;
-  if(c == ']')
-  return 93;
-  if(c == '^')
-  return 94;
-  if(c == '_')
-  return 95;
-  if(c == '`')
-  return 96;
-  if(c == 'a')
-  return 97;
-  if(c == 'b')
-  return 98;
-  if(c == 'c')
-  return 99;
-  if(c == 'd')
-  return 100;
-  if(c == 'e')
-  return 101;
-  if(c == 'f')
-  return 102;
-  if(c == 'g')
-  return 103;
-  if(c == 'h')
-  return 104;
-  if(c == 'i')
-  return 105;
-  if(c == 'j')
-  return 106;
-  if(c == 'k')
-  return 107;
-  if(c == 'l')
-  return 108;
-  if(c == 'm')
-  return 109;
-  if(c == 'n')
-  return 110;
-  if(c == 'o')
-  return 111;
-  if(c == 'p')
-  return 112;
-  if(c == 'q')
-  return 113;
-  if(c == 'r')
-  return 114;
-  if(c == 's')
-  return 115;
-  if(c == 't')
-  return 116;
-  if(c == 'u')
-  return 117;
-  if(c == 'v')
-  return 118;
-  if(c == 'w')
-  return 119;
-  if(c == 'x')
-  return 120;
-  if(c == 'y')
-  return 121;
-  if(c == 'z')
-  return 122;
-  if(c == '{')
-  return 123;
-  if(c == '|')
-  return 124;
-  if(c == '}')
-  return 125;
-  if(c == '~')
-  return 126;
+  if(c == ' ') return 32;
+  if(c == '!') return 33;
+  if(c == '\"' || c == '\"') return 34;
+  if(c == '#') return 35;
+  if(c == '$') return 36;
+  if(c == '%') return 37;
+  if(c == '&') return 38;
+  if(c == '\'') return 39;
+  if(c == '(') return 40;
+  if(c == ')') return 41;
+  if(c == '*') return 42;
+  if(c == '+') return 43;
+  if(c == ',') return 44;
+  if(c == '-') return 45;
+  if(c == '.') return 46;
+  if(c == '/') return 47;
+  if(c == '0') return 48;
+  if(c == '1') return 49;
+  if(c == '2') return 50;
+  if(c == '3') return 51;
+  if(c == '4') return 52;
+  if(c == '5') return 53;
+  if(c == '6') return 54;
+  if(c == '7') return 55;
+  if(c == '8') return 56;
+  if(c == '9') return 57;
+  if(c == ':') return 58;
+  if(c == ';') return 59;
+  if(c == '<') return 60;
+  if(c == '=') return 61;
+  if(c == '>') return 62;
+  if(c == '?') return 63;
+  if(c == '@') return 64;
+  if(c == 'A') return 65;
+  if(c == 'B') return 66;
+  if(c == 'C') return 67;
+  if(c == 'D') return 68;
+  if(c == 'E') return 69;
+  if(c == 'F') return 70;
+  if(c == 'G') return 71;
+  if(c == 'H') return 72;
+  if(c == 'I') return 73;
+  if(c == 'J') return 74;
+  if(c == 'K') return 75;
+  if(c == 'L') return 76;
+  if(c == 'M') return 77;
+  if(c == 'N') return 78;
+  if(c == 'O') return 79;
+  if(c == 'P') return 80;
+  if(c == 'Q') return 81;
+  if(c == 'R') return 82;
+  if(c == 'S') return 83;
+  if(c == 'T') return 84;
+  if(c == 'U') return 85;
+  if(c == 'V') return 86;
+  if(c == 'W') return 87;
+  if(c == 'X') return 88;
+  if(c == 'Y') return 89;
+  if(c == 'Z') return 90;
+  if(c == '[') return 91;
+  if(c == '\\') return 92;
+  if(c == ']') return 93;
+  if(c == '^') return 94;
+  if(c == '_') return 95;
+  if(c == '`') return 96;
+  if(c == 'a') return 97;
+  if(c == 'b') return 98;
+  if(c == 'c') return 99;
+  if(c == 'd') return 100;
+  if(c == 'e') return 101;
+  if(c == 'f') return 102;
+  if(c == 'g') return 103;
+  if(c == 'h') return 104;
+  if(c == 'i') return 105;
+  if(c == 'j') return 106;
+  if(c == 'k') return 107;
+  if(c == 'l') return 108;
+  if(c == 'm') return 109;
+  if(c == 'n') return 110;
+  if(c == 'o') return 111;
+  if(c == 'p') return 112;
+  if(c == 'q') return 113;
+  if(c == 'r') return 114;
+  if(c == 's') return 115;
+  if(c == 't') return 116;
+  if(c == 'u') return 117;
+  if(c == 'v') return 118;
+  if(c == 'w') return 119;
+  if(c == 'x') return 120;
+  if(c == 'y') return 121;
+  if(c == 'z') return 122;
+  if(c == '{') return 123;
+  if(c == '|') return 124;
+  if(c == '}') return 125;
+  if(c == '~') return 126;
   return 0;
 }
diff --git a/src/pp/pp_vis/pp_vis_core.c b/src/pp/pp_vis/pp_vis_core.c
index a10b5a5e..aa7fcebe 100644
--- a/src/pp/pp_vis/pp_vis_core.c
+++ b/src/pp/pp_vis/pp_vis_core.c
@@ -882,6 +882,7 @@ void V_TickForever(WaveLaneCtx *lane)
         panel->parent = V.root_panel;
         panel->key = UI_TransKey();  // TODO: Don't use transient keys
         panel->axis = !panel->parent->axis;
+        panel->pref_ratio = 0.25;
         DllQueuePush(panel->parent->first, panel->parent->last, panel);
         ++panel->parent->count;
 
@@ -912,7 +913,7 @@ void V_TickForever(WaveLaneCtx *lane)
         DllQueuePush(panel->parent->first, panel->parent->last, panel);
         ++panel->parent->count;
 
-        panel->pref_ratio = 0.5;
+        panel->pref_ratio = 0.75;
         panel->is_viewport_panel = 1;
 
         // {
@@ -925,32 +926,32 @@ void V_TickForever(WaveLaneCtx *lane)
         // }
       }
 
-      {
-        V_Panel *panel = PushStruct(perm, V_Panel);
-        panel->parent = V.root_panel;
-        panel->key = UI_TransKey();  // TODO: Don't use transient keys
-        panel->axis = !panel->parent->axis;
-        DllQueuePush(panel->parent->first, panel->parent->last, panel);
-        ++panel->parent->count;
+      // {
+      //   V_Panel *panel = PushStruct(perm, V_Panel);
+      //   panel->parent = V.root_panel;
+      //   panel->key = UI_TransKey();  // TODO: Don't use transient keys
+      //   panel->axis = !panel->parent->axis;
+      //   DllQueuePush(panel->parent->first, panel->parent->last, panel);
+      //   ++panel->parent->count;
 
-        {
-          V_Window *window = PushStruct(perm, V_Window);
-          window->panel = panel;
-          window->key = UI_TransKey();  // TODO: Don't use transient keys
-          // window->is_tile_window = 1;
-          DllQueuePushNP(panel->first_window, panel->last_window, window, next_in_panel, prev_in_panel);
-          ++panel->windows_count;
-        }
-        {
-          V_Window *window = PushStruct(perm, V_Window);
-          window->panel = panel;
-          window->key = UI_TransKey();  // TODO: Don't use transient keys
-          window->is_tile_window = 1;
-          DllQueuePushNP(panel->first_window, panel->last_window, window, next_in_panel, prev_in_panel);
-          ++panel->windows_count;
-        }
-        panel->active_window_idx = 1;
-      }
+      //   {
+      //     V_Window *window = PushStruct(perm, V_Window);
+      //     window->panel = panel;
+      //     window->key = UI_TransKey();  // TODO: Don't use transient keys
+      //     // window->is_tile_window = 1;
+      //     DllQueuePushNP(panel->first_window, panel->last_window, window, next_in_panel, prev_in_panel);
+      //     ++panel->windows_count;
+      //   }
+      //   {
+      //     V_Window *window = PushStruct(perm, V_Window);
+      //     window->panel = panel;
+      //     window->key = UI_TransKey();  // TODO: Don't use transient keys
+      //     window->is_tile_window = 1;
+      //     DllQueuePushNP(panel->first_window, panel->last_window, window, next_in_panel, prev_in_panel);
+      //     ++panel->windows_count;
+      //   }
+      //   panel->active_window_idx = 1;
+      // }
     }
 
     if (frame->is_editing)
@@ -958,6 +959,7 @@ void V_TickForever(WaveLaneCtx *lane)
       Struct(PanelDfsNode) { PanelDfsNode *next; b32 visited; V_Panel *panel; UI_Checkpoint cp; };
       PanelDfsNode *first_panel_dfs = PushStruct(frame->arena, PanelDfsNode);
       first_panel_dfs->panel = V.root_panel;
+      f32 divider_size = 10;
 
       //- Iterate panels
       while (first_panel_dfs)
@@ -968,35 +970,64 @@ void V_TickForever(WaveLaneCtx *lane)
         {
           panel_dfs->visited = 1;
 
+          UI_Report panel_rep = UI_ReportFromKey(panel->key);
+          f32 panel_size = 0;
+          if (panel->axis == Axis_X)
+          {
+            panel_size = DimsFromRng2(panel_rep.screen_rect).x;
+          }
+          else
+          {
+            panel_size = DimsFromRng2(panel_rep.screen_rect).y;
+          }
+
           // Push children to dfs stack
-          V_Panel *ratio_diff_panel = 0;
+          V_Panel *resize_panel = 0;
           for (V_Panel *child = panel->last; child; child = child->prev)
           {
             PanelDfsNode *n = PushStruct(frame->arena, PanelDfsNode);
             n->panel = child;
             SllStackPush(first_panel_dfs, n);
-            if (child->pref_ratio_diff != 0)
+            if (child->resizing)
             {
-              ratio_diff_panel = child;
+              resize_panel = child;
             }
           }
 
-          // Apply ratio diff
-          if (ratio_diff_panel)
+          // Apply resize
+          if (resize_panel)
           {
-            f32 min_ratio = 0.05;
-            f32 ratio_diff = ratio_diff_panel->pref_ratio_diff;
+            UI_Report child_rep = UI_ReportFromKey(resize_panel->key);
+            UI_Report divider_rep = UI_ReportFromKey(resize_panel->divider_key);
+
+            f32 child_pref_size = 0;
+            if (panel->axis == Axis_X)
             {
-              ratio_diff += MaxF32(min_ratio - (ratio_diff_panel->pref_ratio + ratio_diff), 0);
-              ratio_diff -= MaxF32(min_ratio - (ratio_diff_panel->next->pref_ratio - ratio_diff), 0);
+              child_pref_size = frame->ui_cursor.x - child_rep.screen_rect.p0.x - divider_rep.last_down_mouse_offset.x;
             }
-            ratio_diff_panel->next->pref_ratio -= ratio_diff;
-            ratio_diff_panel->pref_ratio += ratio_diff;
-            ratio_diff_panel->pref_ratio_diff = 0;
+            else
+            {
+              child_pref_size = frame->ui_cursor.y - child_rep.screen_rect.p0.y - divider_rep.last_down_mouse_offset.y;
+            }
+
+            f32 ratio_diff = (child_pref_size / panel_size) - resize_panel->pref_ratio;
+            f32 min_ratio = 0.05;
+            {
+              ratio_diff += MaxF32(min_ratio - (resize_panel->pref_ratio + ratio_diff), 0);
+              ratio_diff -= MaxF32(min_ratio - (resize_panel->next->pref_ratio - ratio_diff), 0);
+            }
+
+            resize_panel->next->pref_ratio -= ratio_diff;
+            resize_panel->pref_ratio += ratio_diff;
+            resize_panel->resizing = 0;
           }
 
           // Constrain child raitos
           f32 ratio_accum = 0;
+          if (panel_size != 0)
+          {
+            ratio_accum += (MaxF32(panel->count - 1, 0) * divider_size) / panel_size;
+          }
           for (V_Panel *child = panel->last; child; child = child->prev)
           {
             child->pref_ratio = MaxF32(child->pref_ratio, 0.01);
@@ -1025,7 +1056,7 @@ void V_TickForever(WaveLaneCtx *lane)
             i64 new_active_window_idx = panel->active_window_idx;
             UI_PushCP(UI_BuildColumn());
             {
-              UI_Push(Tint, VEC4(1, 1, 1, 0.95));
+              UI_Push(Tint, VEC4(1, 1, 1, 0.90));
 
               i64 active_window_idx = ClampI64(panel->active_window_idx, 0, MaxI64(panel->windows_count - 1, 0));
               //- Build tab row
@@ -1183,21 +1214,12 @@ void V_TickForever(WaveLaneCtx *lane)
                       bg_color = BlendSrgb(bg_color, theme.button_hot_color, rep.hot);
                       bg_color = BlendSrgb(bg_color, theme.button_active_color, rep.active);
 
-                      // Vec4 border_color = Zi;
-                      // if (tile_kind == frame->equipped_tile)
-                      // {
-                      //   border_color = theme.button_active_color;
-                      //   border_color.w *= 0.5;
-                      // }
-                      // border_color = BlendSrgb(border_color, theme.button_active_color, rep.hot);
-
                       b32 is_selected = tile_kind == frame->equipped_tile;
 
                       Vec4 border_color = Zi;
                       border_color = BlendSrgb(border_color, theme.button_selected_color, rep.selected);
                       border_color = BlendSrgb(border_color, theme.button_active_color, rep.hot);
 
-                      UI_SetNext(Rounding, UI_RPIX(5));
                       UI_SetNext(BackgroundColor, bg_color);
                       UI_SetNext(BorderColor, border_color);
                       UI_SetNext(Border, 1);
@@ -1232,25 +1254,26 @@ void V_TickForever(WaveLaneCtx *lane)
           //- Build divider
           if (panel->next != 0)
           {
-            UI_Key divider_key = UI_KeyF("Divider");
-            UI_Report rep = UI_ReportFromKey(divider_key);
+            panel->divider_key = UI_KeyF("Divider");
+            UI_Report rep = UI_ReportFromKey(panel->divider_key);
 
-            // Vec4 hovered_color = Rgb32(0x103c4c);
-            Vec4 hovered_color = VEC4(0.5, 0.5, 0.5, 1);
-            Vec4 pressed_color = hovered_color;
-            pressed_color.w = 0.2;
+            Vec4 active_color = theme.button_active_color;
+            Vec4 hot_color = BlendSrgb(theme.button_hot_color, theme.button_active_color, 0.25);
 
-            Vec4 bg_color = theme.window_background_color;
-            bg_color.x = 0.4;
-            bg_color = BlendSrgb(bg_color, hovered_color, rep.hot);
-            bg_color = BlendSrgb(bg_color, pressed_color, rep.active * rep.hovered);
+            Vec4 bg_color = Zi;
+            bg_color = BlendSrgb(bg_color, hot_color, rep.hot);
+            bg_color = BlendSrgb(bg_color, active_color, rep.active);
 
+            Vec4 border_color = Zi;
+            f32 visible_size = 2.0;
+
+            UI_SetNext(BackgroundColor, bg_color);
+            UI_SetNext(BorderColor, border_color);
+            UI_SetNext(Border, MaxF32((divider_size / 2.0) - (visible_size / 2.0), 0));
             UI_SetNext(Flags, UI_BoxFlag_Interactable);
-            // UI_SetNext(BackgroundColor, bg_color);
-            // UI_SetNext(Border, 2);
             UI_SetNext(AxisSize, UI_GROW(1, 1), .axis = panel->axis);
-            UI_SetNext(AxisSize, UI_PIX(10, 1), .axis = !panel->axis);
-            UI_BuildBoxEx(divider_key);
+            UI_SetNext(AxisSize, UI_PIX(divider_size, 1), .axis = !panel->axis);
+            UI_BuildBoxEx(panel->divider_key);
 
             if (rep.is_hot || rep.m1.held)
             {
@@ -1266,27 +1289,7 @@ void V_TickForever(WaveLaneCtx *lane)
 
             if (rep.m1.held)
             {
-              UI_Report panel_rep = UI_ReportFromKey(panel->key);
-              UI_Report parent_rep = UI_ReportFromKey(panel->parent->key);
-
-              // FIXME: Height
-              f32 parent_size = 0;
-              f32 new_size = 0;
-              if (panel->axis == Axis_X)
-              {
-                parent_size = DimsFromRng2(parent_rep.screen_rect).y;
-                new_size = frame->ui_cursor.y - panel_rep.screen_rect.p0.y;
-              }
-              else
-              {
-                parent_size = DimsFromRng2(parent_rep.screen_rect).x;
-                new_size = frame->ui_cursor.x - panel_rep.screen_rect.p0.x;
-              }
-
-              f32 old_ratio = panel->pref_ratio;
-              f32 new_ratio = new_size / parent_size;
-              f32 ratio_diff = new_ratio - old_ratio;
-              panel->pref_ratio_diff = ratio_diff;
+              panel->resizing = 1;
             }
           }
 
diff --git a/src/pp/pp_vis/pp_vis_core.h b/src/pp/pp_vis/pp_vis_core.h
index 87b72914..640a47c6 100644
--- a/src/pp/pp_vis/pp_vis_core.h
+++ b/src/pp/pp_vis/pp_vis_core.h
@@ -164,9 +164,10 @@ Struct(V_Panel)
   i64 count;
 
   UI_Key key;
+  UI_Key divider_key;
 
   f32 pref_ratio;
-  f32 pref_ratio_diff;
+  b32 resizing;
 
   Axis axis;
 
diff --git a/src/ui/ui_shaders.g b/src/ui/ui_shaders.g
index 05dd9663..befa58ad 100644
--- a/src/ui/ui_shaders.g
+++ b/src/ui/ui_shaders.g
@@ -98,7 +98,7 @@ PixelShader(UI_DRectPS, UI_DRectPSOutput, UI_DRectPSInput input)
 
     // Border color
     {
-      f32 half_border_dist_fwidth = fwidth(border_dist) * 0.5;
+      f32 half_border_dist_fwidth = fwidth_fine(border_dist) * 0.5;
       f32 border_alpha = smoothstep(half_border_dist_fwidth, -half_border_dist_fwidth, border_dist);
       final_color = lerp(final_color, border_color, border_alpha);
     }