matrix.org/sass/_docs.scss

header {
    margin-bottom: 1em;

    h1 {
        margin-bottom: 0;
    }

    .metadata {
        font-size: 0.8rem;
    }
}

.docs-body {
    width: 100%;
    display: flex;
    flex-direction: column;
    align-items: start;

    @media (min-width: 767px) {
        flex-direction: row;
    }

    --docs-menu-width: 18rem;
}

.docs-menu {
    position: static;
    overflow-y: auto;
    background-color: #fff;
    border-bottom: 1px solid var(--borders-color);
    width: 100%;
    order: 2;

    @media (min-width: 767px) {
        border-bottom: 0;
        border-right: 1px solid var(--borders-color);
        flex-direction: row;
        position: sticky;
        top: 95px;
        height: 100svh;
        max-width: var(--docs-menu-width);
        order: 1;
    }

    .docs-menu-inner {
        padding: 1.5rem;
    }

    .submenu-checkbox {
        display: none;

        &:not(:checked) ~ .section-submenu-wrap {
            display: none;
        }

        &:not(:checked) ~ .submenu-title {
            .arrow {
                background-image: url("/assets/down-arrow.svg");
                width: 1rem;
                height: 1rem;
                margin: auto 0;
            }
        }

        &:checked ~ .submenu-title {
            .arrow {
                background-image: url("/assets/up-arrow.svg");
                width: 1rem;
                height: 1rem;
                margin: auto 0;
            }
        }
    }

    .submenu-title {
        display: flex;
        flex-direction: row;
        gap: 0.8rem;

        font-size: 1.2rem;
        font-weight: 700;

        cursor: pointer;
        user-select: none;
    }

    ul {
        padding-inline-start: 0;
        list-style: none;

        li {
            margin-inline-start: 1em;
            margin-block: 0.5em;

            ul {
                border-left: 1px solid #bbb;

                li:hover {
                    color: var(--color-link);
                    text-decoration: underline;
                }
            }
        }

        a {
            color: var(--color-text);
        }
    }
}

.docs-content {
    flex: 1;
    order: 2;
    
    @media (min-width: 767px) {
        order: 1;
    }

    article p img {
        max-width: 100%;
        margin-inline: auto;
    }
}

#docs-menu-checkbox:not(:checked) ~ .docs-menu {
    @media (max-width: 767px) {
        display: none;
    }
}

#docs-menu-checkbox:checked ~ .docs-content {
    @media (max-width: 767px) {
        display: none;
    }
}

.mjolnir_button {
    border: 1px solid rgb(217, 217, 217);
    border-radius: 1000px;
    padding: 0 0.4rem;
    background-color: rgb(242, 247, 252);
}

figure {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 1rem;

    margin-inline: 0;
    padding: 1rem;

    border: 1px solid #dedede;
    border-radius: 4px;

    img {
        max-width: 100%;
        max-height: 100%;
    }

    figcaption {
        font-size: 0.8rem;
        text-align: center;
    }
}

.hidden {
    display: none;
}