Fixes $button-min-width-lg

Author: fredtitao

src/scss/_buttons.scss

@@ -10,7 +10,7 @@ $button-min-width: 160px !default;
 $button-min-width-xs: 80px !default;
 $button-min-width-sm: 120px !default;
 $button-min-width-md: 180px !default;
-$button-min-width-lg: 200 !default;
+$button-min-width-lg: 200px !default;
 $button-transition: all 100ms ease !default;
 
 // button colors