body {
    background: #91e6e2; /* fallback color */
    min-height: 100vh;
    margin: 0;
    display: flex;
    justify-content: center;
    align-items: center;
}
body::before {
    content: "";
    display: block;
    position: fixed;
    top: 0; left: 0; right: 0; bottom: 0;
    background: url('content/jam-and-fizz.png') no-repeat center center;
    background-size: contain;
    z-index: -1;
}
audio {
    bottom: 0;
    position: fixed;
    width: 100%;
}