perf[css]: refine style

src/views/errorPage/404.vue

@@ -1,5 +1,4 @@
 <template>
-  <div style="background:#f0f2f5;height:100%;">
   <div class="wscn-http404-container">
     <div class="wscn-http404">
       <div class="pic-404">
@@ -19,10 +18,8 @@
       </div>
     </div>
   </div>
-  </div>
 </template>
 
-
 <script>
 import img_404 from '@/assets/404_images/404.png'
 import img_404_cloud from '@/assets/404_images/404_cloud.png'

src/views/layout/components/AppMain.vue

@@ -24,12 +24,10 @@ export default {
 
 <style scoped>
 .app-main {
-  position: absolute;
-  top: 84px; /* navbar + tags-view = 50 +34 */
-  left: 0;
-  right: 0;
-  bottom: 0;
-  margin: auto;
+  /*84 = navbar + tags-view = 50 +34 */
+  min-height: calc(100vh - 84px);
+  position: relative;
+  overflow: hidden;
 }
 </style>