.block-banner {
    padding-top   : 6em !important;
    padding-bottom: 6em !important;
    max-height: 500px;
    height: 50vw;
}

@media screen and (min-width: 800px) {
    .block-banner {
        padding-top   : 10em !important;
        padding-bottom: 10em !important;
    }
}