.form-required::after {
    content: '';
    vertical-align: super;
    display: inline-block;
    background-image: url(/core/misc/icons/ee0000/required.svg);
    background-repeat: no-repeat;
    background-size: 12px 12px;
    width: 12px;
    height: 12px;
    margin: 0 0.3em;
    }