matrix.org/sass/_base.scss

:root {
    --page-max-width: 57rem;
    --page-with-toc-max-width: 81rem;
    --navbar-height: 5.937rem;

    --color-text: #333;
    --color-text-light: #757575;

    @media (prefers-contrast: more) {
        --color-text: #000;
        --color-text-light: #595959;
    }

    --color-link: #0098d4;

    --page-header-height: 15rem;

    --borders-color: #ddd;
}

* {
    box-sizing: border-box;
}

html {
    scroll-snap-type: y proximity;
    scroll-padding-top: 1.875rem; // obtained by fine tuning
}

body {
    margin: 0;
    min-height: 100svh;
    display: flex;
    flex-direction: column;
    background-color: #fff;
    color: var(--color-text);

    font-family: "Helvetica Neue",
        "Helvetica",
        Arial,
        -apple-system,
        BlinkMacSystemFont,
        "Segoe UI",
        Roboto,
        sans-serif,
        "Apple Color Emoji",
        /* Emojis*/
        "Segoe UI Emoji",
        /* Emojis*/
        "Segoe UI Symbol";

    line-height: 1.75;
}

main {
    flex: 1;
    padding-top: var(--navbar-height);
}

a {
    color: var(--color-link);
    text-decoration: none;
}

ul,
ol {
    margin-top: 0px;
    margin-bottom: 10px;
    padding-left: 40px;
}

p {
    margin-top: 0;
    margin-bottom: 1rem;
}

p:last-child,
blockquote:last-child,
figure:last-child,
ul:last-child,
ol:last-child {
    margin-bottom: 0;
}

.content {
    width: 100%;
    max-width: var(--page-max-width);

    margin: 1rem auto;
    padding-inline: 1rem;

    img {
        height: auto;
        max-height: 40rem;
        max-width: 100%;
    }

    video {
        max-height: 40rem;
        max-width: 100%;
    }
}

.content.with-sidebar {
    max-width: var(--page-with-toc-max-width);
}

.site-footer {
    position: relative;
    z-index: 1;
    background-color: #000;
    width: 100%;
    display: flex;
    align-items: center;
    flex-direction: column;
    padding: 30px 40px;

    a {
        color: #999;
        text-decoration: none;
        margin-inline: .8rem;
    }

    .internal-links {
        width: 100%;
        padding-bottom: 20px;
        max-width: 960px;
        display: flex;
        justify-content: space-between;
        flex-wrap: wrap;

        @media (max-width: 767px) {
            flex-direction: column;
            text-align: center;
        }
    }

    .external-links {
        display: flex;
        width: 100%;
        max-width: 960px;
        justify-content: center;

        a {
            max-width: 100%;
            display: inline-block;

            img {
                margin-inline: .625rem;
            }

            img:hover {
                filter: brightness(0) invert(1);
            }
        }
    }

    a:hover {
        color: #fff;
    }

    p {
        margin-top: 20px;
        color: #999;
    }
}

pre {
    padding: 1rem;
    overflow: auto;
    border-radius: 4px;
}

// The line numbers already provide some kind of left/right padding
pre[data-linenos] {
    padding: 1rem 0;
}

pre table td {
    padding: 0;
}

// The line number cells
pre table td:nth-of-type(1) {
    text-align: center;
    user-select: none;
}

pre mark {
    display: block;
    background-color: rgba(254, 252, 232, 0.9);
}

pre table {
    width: 100%;
    border-collapse: collapse;
}

/* The black block on pages at the top. */
.page-header {
    display: flex;
    flex-direction: column;
    justify-content: center;
    padding-inline: 5.625rem;

    @media (max-width: 767px) {
        padding-inline: 2rem;
    }

    padding-bottom: calc(var(--navbar-height)/2);

    min-height: var(--page-header-height);
    background-color: #000000;
    background-image: url(/assets/page-header-bg.svg);
    background-size: 90% 100%;
    background-position: bottom right;
    background-repeat: no-repeat;

    @media (max-width: 767px) {
        background-size: 250% 100%;
        background-position-x: -533px;
    }

    .hero-block {
        h1 {
            font-style: normal;
            font-weight: 700;
            font-size: 2.8rem;
            line-height: 120%;
            color: #FFFFFF;
        }

        p {
            font-style: normal;
            font-size: 1.4rem;
            line-height: 120%;

            display: flex;
            align-items: center;

            color: #FFFFFF;
            word-wrap: normal;
        }
    }
}

:not(pre)>code {
    color: #f54029;
    border: 1px solid #f54029;
    border-radius: 4px;
    padding: 0 .4rem;
}

a>code {
    border-color: var(--color-link);
    color: var(--color-link);
}

.page_card {
    background-color: #000;
    border-radius: 16px;
    background-image: url("/assets/frontpage/hero_dancing_lines.svg");
    background-size: 100% 100%;
    background-repeat: no-repeat;
    padding: 1rem;

    max-width: 23rem;

    .wrapper {
        display: flex;
        flex-direction: row;
        justify-content: space-between;
    }

    .card_content {
        color: #fff;

        h4 {
            font-size: 1.125rem;
            font-weight: 700;
            padding: 0;
            margin: 0 0 1rem 0;
        }

        p {
            font-size: .9rem;
        }
    }

    .arrow {
        background-image: url("/assets/down-arrow.svg");
        background-repeat: no-repeat;
        background-size: 100% 100%;
        width: 3rem;
        height: 3rem;
        margin: auto 0 auto .5rem;
        transform: rotate(-90deg);
        filter: invert(1);
    }
}

.youtube_placeholder {
    display: flex;
    flex-direction: column;
    justify-content: center;
    aspect-ratio: 16/9;
    width: 100%;
    background-color: #333;

    div {
        display: flex;
        flex-direction: column;
        color: #fff;
        padding: 1.5rem;
        gap: 1.5rem;

        img {
            margin-inline: auto;
        }

        p {
            max-width: 30rem;
            text-align: center;
            margin-inline: auto;
        }

        button {
            max-width: fit-content;
            margin-inline: auto;
            padding: .5rem 1rem;
            border-radius: 9999px;
            background-color: #fff;
            border: 1px solid transparent;
            color: #000;
            cursor: pointer;

            &:hover {
                border: 1px solid #fff;
                color: #fff;
                background-color: #333;
            }
        }
    }
}

.call-to-action {
    background-color: #000;
    border: 2px solid #000;
    color: #fff;
    font-size: 1.125rem;
    font-weight: 600;
    border-radius: 1000px;
    padding: .6em 2em;

    &.inverted {
        border: 2px solid #fff;
        background-color: #fff;
        color: #000;

        &.secondary {
            background-color: #000;
            color: #fff;

            &:hover {
                background-color: #fff;
                color: #000
            }
        }
    }

    &.secondary {
        background-color: #fff;
        color: #000;

        &:hover {
            background-color: #000;
            color: #fff;
        }
    }
}

.cta-row {
    display: flex;
    justify-content: center;
    flex-wrap: wrap;
    column-gap: 1rem;
    row-gap: .5rem;
}

.cta-col {
    display: flex;
    flex-direction: column;
    justify-content: center;
    row-gap: 1rem;

    align-items: center;
}