.rotate-back-button {
    background: url(images/back-btn.png) no-repeat top center;
    float: left;
    width: 38px;
    height: 340px;
    cursor: pointer;
    position: absolute;
    z-index: 100;
}

.rotate-next-button {
    background: url(images/next-btn.png) no-repeat top center;
    float: left;
    width: 38px;
    height: 340px;
    cursor: pointer;
    position: absolute;
    z-index: 100;
    margin-left: 96%;
}