body {
    margin: 0;
    background: url(/images/marketing-background.png) no-repeat center center fixed;
    background-repeat: no-repeat;
    background-size: cover;
    background-color: #1844da;
}

.img-desktop {
    display: block;
    margin: auto;
    width: 80%;
}

.img-mobile {
    display: block;
    margin: auto;
    width: 100%;
}

@media only screen and (max-width: 1200px) {
    .img-desktop {
        display: none;
    }
}

@media only screen and (min-width: 1200px) {
    .img-mobile {
        display: none;
    }
}