Update app.py (#1)

- Update app.py (a5c3383bc826c2e42d053983a401128ec6f32252)


Co-authored-by: BaodeWang <[email protected]>

app.py

@@ -298,15 +298,26 @@ 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="
+                width:100%;
+                height:800px;
+                overflow:auto;
+                border:1px solid #ccc;
+            ">
+              <div style="
+                  min-width:100%;           /* 保证外层 div 至少跟容器一样宽 */
+                  display:flex;
+                  justify-content:center;   /* 小图水平居中 */
+              ">
+                <img src="{src}" style="
+                    width:{percent}%;
+                    height:auto;
+                    display:block;
+                ">
+              </div>
+            </div>
+            """
     else:
         # ---------- 放大模式 ----------
         return (