@mixin alert-variant($background, $border, $color) {

color: color-yiq($background);
// @include gradient-bg($background);
background-color: lighten($background, 5%);
border-color: $border;

hr {
    border-top-color: darken($border, 5%);
}

.alert-link {
    color: darken($color, 10%);
}

}