body {
    margin: 10px auto;
    max-width: 560px;
    padding: 0 10px;
}

@media (prefers-color-scheme: dark) {
    body {
        background: #000;
        color: #fff;
    }
    a, a:visited {
        color: lightblue;
    }
}

canvas {
    display: block;
    position: absolute;
    top: 0;
    left: 0;
    z-index: -1;
    opacity: 0.3;
}

h2 {
    text-decoration: underline;
}

.youtube-video {
    aspect-ratio: 16 / 9;
    width: 100%;
}

.youtube-video-academy {
    aspect-ratio: 4 / 3;
    width: 100%;
}