.atc {
    position: relative;
    background-color: #ff0
}

.atc::before {
    content: attr(data-atc);
    display: block;
    position: absolute;
    color: #ff8c00;
    font-size: small;
    font-weight: 700;
    top: -1rem;
    z-index: 1;
    right: 0
}

.atc-important {
    display: none;
    height: 0;
    width: 0;
    overflow: hidden;
    outline: 0
}