:root {
    --book-cover-color: #FDD716;
    
    scrollbar-color: var(--book-cover-color) black;
}

body {
    background-color: black;
    font-size: 1.15rem;
}

body > * {
    background-color: var(--book-cover-color);
    color: black;
}

a {
    color: blue;
}

a#back-link {
    background-color: black;
    color: var(--book-cover-color);
    position: fixed;
    top: 0.5rem;
    left: 0.5rem;
    font-size: 2rem;
    writing-mode: vertical-rl;
    text-orientation: upright;
}

hgroup,
main {
    box-sizing: border-box;
    border: 1px solid var(--book-cover-color);
    padding: 1rem;
    position: relative;
    width: 85%;
    left: 15%;
}

hgroup {
    text-align: center;
}

main {
    margin-top: 5rem;
    margin-bottom: 60dvh;
}

hr {
    border-color: black;
}

summary {
    font-size: 1.2em;
}

main > details > summary {
    font-size: 1.5em;
    font-weight: bold;
}

figure {
    text-align: center;
}

code {
    color: hsl(300, 100%, 25%);
}

pre {
    border: 1px solid black;
}

/* 

desktop css overrides 

*/
@media only screen and (min-width: 768px) {
    a#back-link {
        writing-mode: unset;
        max-width: 10%;
    }

    hgroup,
    main {
        width: 90%;
        left: 10%;
    }
}