.site-slider{
	width:100%;
	background:url(images/green/header_overlay.png) top center no-repeat, url(/wp-content/uploads/2015/05/grn-stp-bg.png);
}

@media screen and (max-width: 768px) { 
    .site-slider {
        background: url(/wp-content/uploads/2015/05/grn-stp-bg.png);
    }
}