.mdf-arrow-left, .mdf-arrow-right {
    background: url(../img/arrows-slider.png) no-repeat 0 0 transparent;
    background-color: #fff;
    position: absolute;
    content: "";
    width: 39px;
    height: 39px;
}

.mdf-arrow-left:hover { background-color: #ea5859; background-position: -38px 0; opacity: 1; }
.mdf-arrow-right  { background-position: -117px 0; }
.mdf-arrow-right:hover { background-color: #ea5859; background-position: -78px 0; opacity: 1; }