*, ::before, ::after {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}
body {
    height: 100vh;
    overflow-y: hidden;
}
#background {
    height: 100%;
    width: 100vw;
}
model-viewer {
    position: absolute !important;
    top: 0;
    z-index: 10;
}