ul.img-list {
    list-style-type: none;
    margin: 0;
    padding: 0;
    text-align: center;
}

ul.img-list li {
    display: inline-block;
    height: 167px;
    margin: 0;
    position: relative;
    width: 250px;


}

span.text-content span {
    display: table-cell;
    text-align: center;
    vertical-align: middle;
}

ul.img-list li:hover span.text-content {
    opacity: 1;
}

span.text-content {
    background: rgba(0,0,0,0.5);
    color: white;
    cursor: pointer;
    display: table;
    height: 167px;
    left: 0;
    position: absolute;
    top: 20px;
    width: 250px;
    opacity: 0;
    -webkit-transition: opacity 500ms;
    -moz-transition: opacity 500ms;
    -o-transition: opacity 500ms;
    transition: opacity 500ms;
    font-size: 0.7em;
}