diff --git a/packages/designer/src/builtin-simulator/node-selector/index.less b/packages/designer/src/builtin-simulator/node-selector/index.less
index 8239b41ca..46cf7dbf6 100644
--- a/packages/designer/src/builtin-simulator/node-selector/index.less
+++ b/packages/designer/src/builtin-simulator/node-selector/index.less
@@ -6,7 +6,6 @@
   margin-right: 2px;
   color: var(--color-icon-white, @title-bgcolor);
   border-radius: @global-border-radius;
-  margin-right: 2px;
   pointer-events: auto;
   flex-grow: 0;
   flex-shrink: 0;
@@ -45,7 +44,8 @@
     visibility: hidden;
   }
   .instance-node-selector-node {
-    margin: 2px 0;
+    height: 20px;
+    margin-top: 2px;
     &-content {
       padding-left: 6px;
       background: #78869a;
diff --git a/packages/designer/src/builtin-simulator/node-selector/index.tsx b/packages/designer/src/builtin-simulator/node-selector/index.tsx
index af1f6cb14..6fa7d0ad3 100644
--- a/packages/designer/src/builtin-simulator/node-selector/index.tsx
+++ b/packages/designer/src/builtin-simulator/node-selector/index.tsx
@@ -114,7 +114,7 @@ export default class InstanceNodeSelector extends React.Component<IProps, IState
             </div>
           }
           triggerType="hover"
-          offset={[0, 2]}
+          offset={[0, 0]}
         >
           <div className="instance-node-selector">{this.renderNodes(node)}</div>
         </Popup>