body { }

.topbanner.landing-page { display: flex; justify-content: center; background-color: #f1f1f1; }
.topbanner.landing-page .grad { width: 100%; display: flex; justify-content: center; }

@media screen and (min-height: 992px) {
    .topbanner.landing-page { min-height: 500px; }
}