img[title]:hover::after {
    content: attr(title);
    position: absolute;
    background: rgba(0, 0, 0, 0.8);
    color: #fff;
    padding: 5px 10px;
    border-radius: 5px;
    white-space: nowrap;
    z-index: 10;
    top: 0;
    left: 0;
}