修复固定头部时出现的导航栏偏移问题

ruoyi-ui/src/layout/index.vue

@@ -77,6 +77,11 @@ export default {
     }
   }
 
+  .main-container:has(.fixed-header) {
+    height: 100vh;
+    overflow: hidden;
+  }
+
   .drawer-bg {
     background: #000;
     opacity: 0.3;