diff --git a/src/less/base/tree/tree.expander.less b/src/less/base/tree/tree.expander.less
index b2e5b0c85..67aac48d3 100644
--- a/src/less/base/tree/tree.expander.less
+++ b/src/less/base/tree/tree.expander.less
@@ -12,7 +12,7 @@
 .bi-tree-expander-popup.line.solid:before {
   .imagePath(@icon-tree-solid-vertical-line-1, 0, 0, repeat-y);
   width: 24px;
-  left:4px;
+  left: 8px;
 }
 
 .bi-theme-dark {
@@ -23,6 +23,6 @@
   .bi-tree-expander-popup.line.solid:before {
     .imagePath(@icon-tree-solid-vertical-line-1-theme-dark, 0, 0, repeat-y);
     width: 24px;
-    left:4px;
+    left: 8px;
   }
 }