Update app.py

app.py

@@ -298,15 +298,31 @@ def render_img(b64_list, idx, scale):
 
     if scale <= 1:
         # ---------- 居中模式 ----------
-        return (
-            f'<div style="overflow:auto;border:1px solid #ccc;'
-            f'display:flex;justify-content:center;align-items:center;'
-            f'width:100%;height:800px;">'
-            f'  <img src="{src}" '
-            f'       style="width:{percent}%;max-width:none;'
-            f'              height:auto;display:block;" />'
-            f'</div>'
-        )
+        # return (
+        #     f'<div style="overflow:auto;border:1px solid #ccc;'
+        #     f'display:flex;justify-content:center;align-items:center;'
+        #     f'width:100%;height:800px;">'
+        #     f'  <img src="{src}" '
+        #     f'       style="width:{percent}%;max-width:none;'
+        #     f'              height:auto;display:block;" />'
+        #     f'</div>'
+        # )
+
+        return f'''
+            <div style="
+                overflow:auto;border:1px solid #ccc;
+                display:flex;
+                justify-content:center;
+                align-items:center;   /* 垂直也居中 */
+                width:100%;height:800px;">
+                <img src="{src}"
+                     style="
+                       width:{percent}%;
+                       max-width:none;
+                       height:auto;
+                       flex-shrink:0;" />
+            </div>
+            '''
     else:
         # ---------- 放大模式 ----------
         return (