diff --git a/src/elements/button.less b/src/elements/button.less
index 2a608dc21..21d1d79d4 100755
--- a/src/elements/button.less
+++ b/src/elements/button.less
@@ -63,7 +63,7 @@
 
 @activeBackgroundColor: #EAEAEA;
 @activeBackgroundImage: none;
-@activeBoxShadow:  0px 0px 0px 1px rgba(0, 0, 0, 0.05) inset !important;
+@activeBoxShadow: 0px 0px 0px 1px rgba(0, 0, 0, 0.05) inset !important;
 
 @iconMargin: 0.6em;
 @iconHoverOpacity: 0.85;