html,
body {
    overflow: hidden;
    margin: 0;
    font-family: Arial;
    color: #fff;
}
canvas,
main {
    position: absolute;
    width: 100vw;
    height: 100vh;
    user-select: none;
    touch-action: none;
}

main {
    width: 94vw;
    padding: 2vh 3vw;
}

[onclick] {
    cursor: pointer;
    opacity: 0.5;
}

[onclick]:hover {
    opacity: 1;
}