mail/src/sass/components/_labels.scss

.label {
    display: inline-block;
    padding: $label-padding-vertical $label-padding-horizontal;
    font-size: $label-font-size;
    text-align: center;
    vertical-align: middle;
    border-radius: ($line-height-base * $label-font-size) + 2 * $label-padding-vertical;
    white-space: nowrap;
    background-color: $label-back-color;
    color: $label-color;
    transition: background-color 0.3s;

    &[data-icon]:before {
        padding-right: 0.5em;
    }
    &[data-icon-append]:after {
        padding-left: 0.5em;
    }
}

.label-primary {
    background-color: $label-primary-back-color;
    color: $label-primary-color;
    background-image: url(data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAYAAAAGCAYAAADgzO9IAAAAJUlEQVQIW2NkQABJIPM5lCvJCGMgC4LYIAkUlTAFMB0gjRQaBQCw8go5lVnl5wAAAABJRU5ErkJggg==);

    @include respond-to(retina) {
        background-size: 3px 3px;
    }
}

.label-primary-click {
    position: relative;

    &:hover,
    &:focus {
        transition: none;
        background-color: lighten($label-primary-back-color, 5%);
    }

    &:active,
    &.active {
        top: 1px;
        left: 1px;
    }
}

.label-blank {
    background-color: transparent;
    color: $color-black;
    text-align: left;
    padding-left: 0;
    padding-right: 0;
}

.label-light {
    background-color: $label-light-back-color;
    color: $label-light-color;
    box-shadow: inset 1px 1px 0px $label-light-shadow-color;
    padding: $label-light-padding-vertical $label-light-padding-horizontal;
    min-width: 2.5em;
    font-weight: bold;
    font-size: $font-size-base;
}