diff --git a/README.md b/README.md
index cb8e9a3..aef7c00 100644
--- a/README.md
+++ b/README.md
@@ -7,10 +7,12 @@ The subject is available here: [Test Algo](./test_algo.pdf)
 - [X] dumb packing 
 - [ ] skyline
 - [X] add raygui
+- [X] resize box
 - [ ] add box in gui by pressing down
 - [ ] delete box in gui by clicking
 - [ ] wrap stb_rect_pack?
 - [X] change bbox api to origin + size
+- [ ] dummy A2
 
 ##  Installation
 
diff --git a/src/main_gui.cpp b/src/main_gui.cpp
index 41edd81..2409ddc 100644
--- a/src/main_gui.cpp
+++ b/src/main_gui.cpp
@@ -1,3 +1,4 @@
+#include <algorithm>
 #include <cstdlib>
 #include <cstring>
 #include <filesystem>
@@ -19,6 +20,8 @@
 
 namespace fs = std::filesystem;
 
+constexpr int resize_handle = 20;
+
 Rectangle rect_from_bbox(const freling::BoundingBox& box,
                          const Vector2& offset) {
     const Rectangle rect = {offset.x + box.x, offset.y + box.y,
@@ -33,6 +36,11 @@ void draw(const freling::BoundingBox& box,
     const Rectangle rect = rect_from_bbox(box, offset);
     DrawRectangleRec(rect, ColorAlpha(color, 0.3));
     DrawRectangleLinesEx(rect, 3, color);
+    DrawTriangle(
+        (Vector2){rect.x + rect.width - resize_handle, rect.y + rect.height},
+        (Vector2){rect.x + rect.width, rect.y + rect.height},
+        (Vector2){rect.x + rect.width, rect.y + rect.height - resize_handle},
+        color);
 }
 
 Image image_from_frame(const Frame& frame) {
@@ -112,6 +120,7 @@ int main(int argc, const char* argv[]) {
     Vector2 mouse_pos = {0};
     Vector2 mouse_delta = {0};
     int b_moving_idx = -1;
+    int b_resize_idx = -1;
 
     while (!WindowShouldClose()) {
         //
@@ -124,17 +133,33 @@ int main(int argc, const char* argv[]) {
             const Rectangle rect = rect_from_bbox(box, in_offset);
             if (CheckCollisionPointRec(mouse_pos, rect) and
                 IsMouseButtonPressed(MOUSE_BUTTON_LEFT)) {
-                b_moving_idx = b;
+                const Rectangle handle_area = {
+                    rect.x + rect.width - resize_handle,
+                    rect.y + rect.height - resize_handle, resize_handle,
+                    resize_handle};
+                if (CheckCollisionPointRec(mouse_pos, handle_area)) {
+                    b_resize_idx = b;
+                } else {
+                    b_moving_idx = b;
+                }
             }
         }
         if (IsMouseButtonReleased(MOUSE_BUTTON_LEFT)) {
             b_moving_idx = -1;
+            b_resize_idx = -1;
         }
         if (b_moving_idx != -1) {
             auto& box = bboxes[b_moving_idx];
             box.x += mouse_delta.x;
             box.y += mouse_delta.y;
         }
+        if (b_resize_idx != -1) {
+            auto& box = bboxes[b_resize_idx];
+            box.width = std::max(static_cast<int>(box.width + mouse_delta.x),
+                                 resize_handle);
+            box.height = std::max(static_cast<int>(box.height + mouse_delta.y),
+                                  resize_handle);
+        }
 
         //
         // Draw