fix: smaller padding

Author: brandyscarney

core/src/components/button/button.md.vars.scss

@@ -85,7 +85,7 @@ $button-md-large-font-size:                             20px !default;
 // --------------------------------------------------
 
 /// @prop - Padding top of the small button
-$button-md-small-padding-top:                           5px !default;
+$button-md-small-padding-top:                           4px !default;
 
 /// @prop - Padding end of the small button
 $button-md-small-padding-end:                           .9em !default;