优化固定头部页签滚动条被隐藏的问题

src/layout/index.vue

@@ -78,6 +78,10 @@ function setLayout() {
     height: 100%;
   }
 
+  :deep(.el-scrollbar__bar).is-vertical {
+    z-index: 10;
+  }
+
   :deep(.el-scrollbar__wrap) {
     overflow-x: hidden;
   }