diff --git a/src/bootstrap.config.less b/src/bootstrap.config.less
index f034373..f2d357b 100644
--- a/src/bootstrap.config.less
+++ b/src/bootstrap.config.less
@@ -1,2 +1,3 @@
 @pre-border-color: @pre-bg; // hide the border.
+
 @import "./main.less";