.nivo-directionNav a.nivo-prevNav {
    left: auto;
    right: 0;
    background-image: url("slider-arrow-right.png");
}
.nivo-directionNav a.nivo-nextNav {
    left: 0;
    right: auto;
    background-image: url("slider-arrow-left.png");
} 

@media all and (min-width: 769px) {
    .main-banner-1 {
        float: right;
    }

    .main-banner-2 {
        float: right;
        border-right: 10px solid #fff;
        border-left: 0;
    }
}