* {
    margin: 0;
    padding: 0;
    font-family: sans-serif;
}
html {
    height: 100%;
}
body {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 100%;
    height: 100%;
    flex-direction: column;
}
canvas {
    /*border: solid 1px black;*/
}
@media (max-width: 500px) {
    canvas {
        max-width: 100%;
        max-height: 100%;
    }
}