.product-banner {
    width: 100%;
    height: 100px;
    line-height: 0;
}
.product-banner img {
    width: 100%;
}

@media screen and (max-width: 768px){
    .product-banner {
        height: auto;
    }
}

@media screen and (max-width: 431px){
    .product-banner {
        height: 50px;
    }
}