* {
    margin: 0;
    padding: 0;
}

#container img {
    image-rendering: -webkit-optimize-contrast; /* webkit */
    image-rendering: -moz-crisp-edges /* Firefox */
}

.rotate90 {
    transform: rotate(90deg);
}

.rotate180 {
    transform: rotate(180deg);
}

.rotate270 {
    transform: rotate(270deg);
}

.sprite {
    position: absolute;
    transition: left .1s, top .1s;
    z-index: 2;
}