cerebrate/webroot/theme/scss/mixins/_toast.scss

@mixin toast-variant($background, $border, $color) {
    color: $color;
    @include gradient-bg($background);
    border-color: $border;

    @debug "The colour is: #{$border}";
    strong {
        border-top-color: darken($border, 5%);
    }
}