$badge-font-size: 0.75em !default;
$medium-gray: #999 !default;
$alert-color: #fff6bf !default;
$error-color: #fbe3e4 !default;
$notice-color: #e5edf8 !default;
$success-color: #e6efc2 !default;
@mixin badge($color: $medium-gray) {
    background-color: $color;
    border-radius: $badge-font-size * 5;
    color: darken($color, 60%);
    display: inline-block;
    font-size: $badge-font-size;
    line-height: 1;
    padding: 0.4em 1.2em;
}

.badge {
    @include badge;
}

.badge-alert {
    @include badge($alert-color);
}

.badge-error {
    @include badge($error-color);
}

.badge-notice {
    @include badge($notice-color);
}

.badge-success {
    @include badge($success-color);
}