Button hover colors should be in _variables.scss file
Created by: mwentz
The mixin for button-variant is defined like this:
@mixin button-variant($background, $border, $active-background: darken($background, 7.5%), $active-border: darken($border, 10%))
Because of this, if you want to have the active background 10% darker or 7.5% lighter (for example) you either have to change the mixin file or write more custom css. This could be easily fixed:
/mixins/_buttons.scss
@mixin button-variant($background, $border, $active-background, $active-border)
_variables.scss
$active-background: darken($background, 7.5%);
$active-border: darken($border, 10%);
It looks as though this was probably the original intent, but somebody forgot to move those variables out of the mixin file.