Update app.py

app.py

@@ -301,7 +301,7 @@ def render_img(b64_list, idx, scale):
         return (
             f'<div style="overflow:auto;border:1px solid #ccc;'
             f'display:flex;justify-content:center;align-items:center;'
-            f'width:100%;height:auto;">'
+            f'width:100%;height:800px;">'
             f'  <img src="{src}" '
             f'       style="width:{percent}%;max-width:none;'
             f'              height:auto;display:block;" />'