diff --git a/src/less/resource/background.less b/src/less/resource/background.less
index f839d3c4f..9bd3351f9 100644
--- a/src/less/resource/background.less
+++ b/src/less/resource/background.less
@@ -50,7 +50,7 @@
     content: '';
     border-left: 1px dashed #D0D4DA;
     height: calc(~"100% - 3px");
-    left: 12px;
+    left: 11px;
     margin-top: 1px;
   }
 }