diff --git a/README.md b/README.md
index b143d12..94b1c30 100644
--- a/README.md
+++ b/README.md
@@ -2,7 +2,7 @@
 
 neovim theme for code, not colors.
 
-<img width="1511" height="910" alt="Image" src="https://github.com/user-attachments/assets/5d94c01e-8b84-41d4-9dd4-52f9552cd892" />
+![Image](https://github.com/user-attachments/assets/9abb5126-15d7-4de4-ad6d-ec35975fec03)
 
 ## Installation
 
diff --git a/scripts/thumbnail.py b/scripts/thumbnail.py
index 9118878..21bf356 100755
--- a/scripts/thumbnail.py
+++ b/scripts/thumbnail.py
@@ -20,8 +20,10 @@ mask = np.zeros((height, width), dtype=np.uint8)
 
 for y in range(height):
     for x in range(width):
-        progress = (x + (height - y)) / (width + height)
-        mask[y, x] = int(progress * 255)
+        if y * width < x * height:
+            mask[y, x] = 255
+        else:
+            mask[y, x] = 0
 
 mask_img = Image.fromarray(mask, mode="L")
 result = Image.composite(light, dark, mask_img)