diff --git a/src/sidebar-item/index.less b/src/sidebar-item/index.less
index 311c4f9c5..49b6cd2d9 100644
--- a/src/sidebar-item/index.less
+++ b/src/sidebar-item/index.less
@@ -40,10 +40,9 @@
       position: absolute;
       top: 50%;
       left: 0;
-      width: 4px;
-      height: 16px;
+      width: @sidebar-selected-border-width;
+      height: @sidebar-selected-border-height;
       background-color: @sidebar-selected-border-color;
-      border-radius: @border-radius-md;
       transform: translateY(-50%);
       content: '';
     }
diff --git a/src/style/var.less b/src/style/var.less
index c5663d999..3eced0583 100644
--- a/src/style/var.less
+++ b/src/style/var.less
@@ -626,6 +626,8 @@
 @sidebar-background-color: @background-color;
 @sidebar-selected-font-weight: @font-weight-bold;
 @sidebar-selected-text-color: @text-color;
+@sidebar-selected-border-width: 4px;
+@sidebar-selected-border-height: 16px;
 @sidebar-selected-border-color: @red;
 @sidebar-selected-background-color: @white;