main {
    min-height: 50vh;
}
canvas {
    max-height: 60vh;
}

.centered {
    display: block;
    text-align: center;
}
.verysmall {
    font-size: x-small;
}

.github-corner:hover .octo-arm {
    animation: octocat-wave 560ms ease-in-out
}
@keyframes octocat-wave {

    0%,
    100% {
        transform: rotate(0)
    }

    20%,
    60% {
        transform: rotate(-25deg)
    }

    40%,
    80% {
        transform: rotate(10deg)
    }
}