daux.io/themes/d3/scss/_structure.scss

*, *:after, *:before {
    box-sizing: border-box;
}

body {
    margin: 0;
    padding: 0;
}

/* ============================================================================
Docs Body & Page Structure
============================================================================ */

html {
    font-size: 14px;

    @media (--viewport-large) {
        font-size: 16px;
    }
}

html, body {
    height: 100%;
    background-color: #fff;
    color: var(--text);
}

.Columns {
    &__left {
        background-color: var(--sidebar-background);
    }

    &__right {
        &__content {
            padding: 10px;
            background-color: #fff;
        }
    }
}

// mobile friendly sub-nav
.Collapsible__content {
    display: none;
}

.Collapsible__trigger {
    margin: 12px;
    padding: 7px 10px;
    background-color: transparent;
    border: none;
    float: right;

    @include kill-background-image;
    @include kill-box-shadow;

    &__bar {
        display: block;
        width: 18px;
        height: 2px;
        margin-top: 2px;
        margin-bottom: 3px;
        background-color: var(--sidebar-collapsible--hamburger-color);
    }

    &:hover {
        background-color: var(--sidebar-collapsible--hamburger-hover-background);

        @include kill-box-shadow;

        .Collapsible__trigger__bar {
            background-color: var(--sidebar-collapsible--hamburger-hover-color);
        }
    }
}

@media screen and (min-width: 769px) {
    body {
        //Needed only for floating code blocks
        background-color: var(--content-floating-blocks-background);
    }

    .Navbar {
        position: fixed;
        z-index: 1030;
        width: 100%;
    }

    .Collapsible {
        &__trigger {
            display: none !important;
        }

        &__content {
            display: block !important;
        }
    }

    .Columns {
        height: 100%;

        &:after,
        &:before {
            content: " ";
            display: table;
        }

        &:after {
            clear: both;
        }

        &__left, &__right {
            position: relative;
            min-height: 1px;
            float: left;
            overflow: auto;
            height: 100%;
        }

        &__left {
            width: 25%;
            border-right: 1px solid var(--sidebar-border);
            overflow-x: hidden;
        }

        &__right {
            width: 75%;

            &__content {
                padding: 0 20px 20px;
                min-height: 100%;
            }
        }
    }
}