.box {
    display: inline;
}

img {
    width:100%
}

td {
    vertical-align: top;
    text-align: center;
    margin-left: auto;
    margin-right: auto;
}

td span {display: none; position: absolute; bottom: 0; left: 0; right: 0; background: #333; color: #fff; }
td:hover span {display: block; }