html, body {
    margin: 0;
    padding: 0;
    height: 100%;
    width: 100%;
    overflow: hidden;
}

body {
    background-image:
        url("splash-mobile.jpg"),
        linear-gradient(to bottom, #3c3a3b, #494949);
    background-size: contain, cover;
    background-position: center center, center center;
    background-repeat: no-repeat;
    background-attachment: fixed;
}

@media (orientation: landscape) {
    body {
        background-image: url("splash.jpg");
        background-size: cover;
    }
}