div.item {
    vertical-align: top;
    display: inline-block;
    text-align: center;
    width: 100%;
    position: absolute;
    top: 50%;
    -ms-transform: translateY(-50%);
    transform: translateY(-50%);
}

div.item img {
    width:100%
}

.caption {
    color: red;
}