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src/App.vue

@@ -15,6 +15,15 @@ export default {
 </script>
 
 <style lang="scss">
+.el-tree {
+  .is-current {
+    &>div:nth-child(1) {
+      &>.custom-tree-node {
+        color: #409eff !important;
+      }
+    }
+  }
+}
 .el-dialog {
   margin-bottom: 15vh !important;
 }