.modal-close {
    position: absolute;
    top: 5px;
    right: 5px;
    margin: 0;
    padding: 0 4px 5px 5px;
    overflow: hidden;
    font-size: 13px;
    width: 7px;
    height: 11px;
    background: url('https://edge.fscdn.org/assets/img/sprite-icons-close-3ce3b111c797b0bbf68a4dcc28e74973.png') no-repeat left top;
    cursor: pointer;
    text-indent: -1000px;
}

.modal-close:hover {
    background-position: left bottom;
}