html {
    height: 100%;
    overflow: hidden;
}

body {
    height: 100%;
    background-color: black;
    display: flex;
    justify-content: center;
    align-items: center;
}

canvas {
    position: absolute;
}

.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)
    }
}

@media (max-width: 500px) {
    .github-corner:hover .octo-arm {
        animation: none
    }

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