要事日记超出一屏，导航栏始终保持在顶部

src/layout/index.vue

@@ -11,7 +11,7 @@
     />
     <sidebar class="sidebar-container" />
     <div :class="{ hasTagsView: needTagsView }" class="main-container">
-      <div :class="{ 'fixed-header': fixedHeader }">
+      <div :class="{ 'fixed-header': fixedHeader }" id="box">
         <navbar />
         <tags-view v-if="needTagsView" />
       </div>
@@ -112,4 +112,12 @@ export default {
 .mobile .fixed-header {
   width: 100%;
 }
+.main-container{
+  position: relative;
+}
+#box{
+  position: sticky;
+  top: 0px;
+  z-index: 99999;
+}
 </style>