body {
    background-color: #000;
    background-image: none;
}

.masthead {
    padding-top: 30.86%; /* The height is 30.86% of the width (500 / 1620) */
}

.landing-title {
    color: black;
}

@media
only screen and (-webkit-min-device-pixel-ratio:2),
only screen and (min--moz-device-pixel-ratio:2),
only screen and (-moz-min-device-pixel-ratio:2),
only screen and (-o-min-device-pixel-ratio:2/1),
only screen and (min-device-pixel-ratio:2),
only screen and (min-resolution:192dpi),
only screen and (min-resolution:2dppx) {
    .masthead { background-image: url("../theme/banner_2x.png"); }
}