* {
    margin: 0; padding: 0;
}

.sequential {
    position: absolute;
    top: 50%; left: 50%;
    margin: -205px;
    overflow:hidden;
    width: 410px; height: 130px;
    background-image: url(../img/logo_top_anim_v01_b_001.png);
}

.open {
    background-position: 0 410px;
}