body {
    overflow: hidden;
    margin: 0;
    background: #00061a;
}

#canvas {
    position: fixed;
    top: var(--site-header-height, 64px);
    left: 0;
    z-index: 0;
    width: 100vw;
    height: calc(100vh - var(--site-header-height, 64px) - var(--site-footer-height, 56px));
}