.in4m-tiles .item {
        transition: top 1s ease, left 0.5s ease, opacity 1s ease;
        position:relative;
        box-sizing:border-box;
        -moz-box-sizing:border-box;
        opacity:0;
        list-style-type:none;
}
.in4m-tiles-pre {
    position:relative;
    overflow:hidden;
}
.in4m-tiles-pre .item {
    opacity:0;
    position:absolute;
    top: -100%;
}
.in4m-tiles-pre .item:nth-child(2n) {
    top: 100%;
}
.in4m-tiles-pre.in4m-tiles .item {
    opacity:1;
}