Add !default to $button-shadow-inset (#483)

The use of !default allows for the variable to be overwritten if the user wishes to do so

diff --git a/sass/elements/button.sass b/sass/elements/button.sass
index aea44b825cdd7a2643add7b1f81096855c2545cf..c0e1e527e5281bd9774e7d4dae5a554a3be06e02 100644 (file)
--- a/sass/elements/button.sass
+++ b/sass/elements/button.sass
@@ -11,7 +11,7 @@ $button-focus-border: $link-focus-border !default
 $button-active: $link-active !default
 $button-active-border: $link-active-border !default
 
-$button-shadow-inset: inset 0 1px 2px rgba($black, 0.2)
+$button-shadow-inset: inset 0 1px 2px rgba($black, 0.2) !default
 
 @function buttonIconSpacing($button-font-size, $icon-width)
   // The button font-size value with no unit