修复了下拉框元素宽度不对的问题

frontend/Web/index.html

@@ -76,6 +76,9 @@
       padding: 10px;
       text-decoration: none;
       color: #333;
+      text-align: center; /* Horizontally center the text */
+      width: 100%; /* Make the width 100% */
+      box-sizing: border-box; /* Include padding in the width */
     }
 
     .dropdown-content a:hover {