.parent {
    width: 100%;
    height: 100%;
    display: table;
    position: absolute;
    top: 0;
    left: 0;
    
    > .inner {
        display: table-cell;
        text-align: center;
        vertical-align: middle;
    }
}

.block {
    display: inline-block;
    
    img {
        display: block;
        border: none;
    }
}