修复灰度模态框的显示异常；

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src/layout/header-aside/components/header-theme/index.vue

@@ -5,7 +5,7 @@
         <d2-icon name="diamond" style="font-size: 16px"/>
       </el-button>
     </el-tooltip>
-    <el-dialog title="主题" width="600px" :visible.sync="dialogVisible">
+    <el-dialog title="主题" width="600px" :visible.sync="dialogVisible" :append-to-body="true">
       <d2-theme-list style="margin-top: -25px;"/>
     </el-dialog>
   </div>