fix[Css]: fixed github-corner css bug

Author: PanJiaChen

src/views/dashboard/admin/index.vue

@@ -1,6 +1,6 @@
 <template>
   <div class="dashboard-editor-container">
-    <github-corner style="position: absolute; top: 0px; border: 0; right: 0;" />
+    <github-corner class="github-corner" />
 
     <panel-group @handleSetLineChartData="handleSetLineChartData" />
 
@@ -100,6 +100,15 @@ export default {
 .dashboard-editor-container {
   padding: 32px;
   background-color: rgb(240, 242, 245);
+  position: relative;
+
+  .github-corner {
+    position: absolute;
+    top: 0px;
+    border: 0;
+    right: 0;
+  }
+
   .chart-wrapper {
     background: #fff;
     padding: 16px 16px 0;