update：nav-pos组件样式还原

src/components/layout-element/structure/app-nav-pos/app-nav-pos.less

 .app-nav-pos {
     width: 100%;
     height: 100%;
-}
-.app-nav-pos.is-layout {
-    margin-left: 12px;
-    margin-right: 12px;
-    padding-left: 12px;
-    padding-right: 12px;
-    height: calc(100% - 12px);
-    width: auto;
-    background-color: #fff;
 }
\ No newline at end of file

src/components/layout-element/structure/app-nav-pos/app-nav-pos.vue

@@ -118,7 +118,7 @@ export default class AppNavPos extends Vue {
     get curClassName() {
         const currentModel = this.layoutModelDetails[this.itemName];
         if (currentModel) {
-            return `app-nav-pos ${this.itemName} ${currentModel.sysCss} ${currentModel && 'is-layout'}`;
+            return `app-nav-pos ${this.itemName} ${currentModel.sysCss}`;
         }
 
     }