img[data-sizes="auto"] { 
    display: block; 
    width: 100%; 
}

.mainnav {
    margin-bottom: 0;
}

.banner-container {
    background-repeat: no-repeat;
    background-size: cover;
    background-position: center;
    padding: 30px 0;
}

@media only screen and (max-width: 40em) {
    .banner-container {
        padding: 10px 0;
    }
}