.sub-banner {
    height: 338px !important;
}
.sub-banner .banner-bg
{
    height:100%;
    background: url(../images/banner/banner-product.jpg) no-repeat center center;
}
@media only screen and (max-width: 750px) {
	.sub-banner .banner-bg {
		height: 100%;
		background: url(../images/banner/banner-product-m.jpg) no-repeat center center;
		background-size: 100% 100%;
	}
}