html, body {
    display: grid;
    place-items: center;
    margin: 0;
    padding: 0;
}
html, body, * {
    box-sizing: border-box;
}
html {
    width: 100%;
    height: 100%;
    background-color: #000;
}
body {
    width: min(100vh, 100vw);
    height: min(100vh, 100vw);
}
body > canvas {
    background-color: #000;
    display: block;
    margin: 0;
    padding: 0;
    max-width: 100% !important;
    max-height: 100% !important;
    width: auto !important;
    height: auto !important;
    overflow: hidden;
}