diff --git a/src/less/base/segment/button.segment.less b/src/less/base/segment/button.segment.less
index ff94a544d..66fbed510 100644
--- a/src/less/base/segment/button.segment.less
+++ b/src/less/base/segment/button.segment.less
@@ -1,13 +1,13 @@
 @import "../../index";
 
 .bi-segment-button {
-  @transition: color .3s,background .3s,border-color .3s,box-shadow .3s;
+  @transition: color 0.3s, background 0.3s, border-color 0.3s, box-shadow 0.3s;
   .transition(@transition);
   color: @color-bi-text-highlight;
 }
 
-.bi-line-segment-button{
-  .line-segment-button-line{
-    .transition(background .3s);
+.bi-line-segment-button {
+  .line-segment-button-line {
+    .transition(background 0.3s);
   }
-}
\ No newline at end of file
+}