Update static/index.html

static/index.html

@@ -22,7 +22,7 @@
             box-shadow: 0 4px 20px rgba(0, 0, 0, 0.1);
         }
         #chat-history {
-            height: 475px;
+            height: 506px;
             overflow-y: auto;
             margin-bottom: 10px;
             padding: 10px;