.owl-nav {
    width: 0px;
    height: 0px;
}
.owl-prev, .owl-next {
    display: block;
    float: left;
    position: absolute;
    width: 32px;
    height: 82px;
    top: 50%;
    margin-top: -41px;    
    z-index: 10;
}
.owl-prev {
    left: -32px;
    background-image: url('a_sx.png');
}
.owl-next {
    right: -32px;
    background-image: url('a_dx.png');
}