style: 修改总览编辑监测区域样式

src/views/disaster/overview/components/key-monitor-area/UpdateMonitorArea.vue

@@ -227,7 +227,21 @@
 
   .mask {
     height: 26px;
-    width: 100px;
+    width: 100%;
+  }
+
+  :deep(.thumb-nail) {
+    display: block;
+    position: absolute;
+    top: 0;
+    left: 0;
+    right: 0;
+    bottom: 0;
+    z-index: 99;
+  }
+
+  :deep(.el-tree-node__content) {
+    position: relative;
   }
 
   .divider {