для кнопок возможно попробовать так - в sass исходниках переопределить файл
/scss/mixins/_buttons.scss
@mixin button-variant(
$background,
$border,
$change,
$btn-hover-change-bg,
$btn-hover-change-border,
$btn-active-change-bg,
$btn-active-change-border) {
@if $change == "darken" {
$hover-bg: darken($background, $btn-hover-change-bg);
$hover-border: darken($border, $btn-hover-change-border);
$active-bg: darken($background, $btn-active-change-bg);
$active-bg: darken($border, $btn-active-change-border);
} else {
$hover-bg: lighten($background, $btn-hover-change-bg);
$hover-border: lighten($border, $btn-hover-change-border);
$active-bg: lighten($background, $btn-active-change-bg);
$active-bg: lighten($border, $btn-active-change-border);
}
...
}
}
как раз переменные $hover-bg, $active-bg