.navigation {
    position: -webkit-sticky;
    position: sticky;
    top: 0;
    align-self: start;
    font-size: 1.1em;
    width: 240px;
    flex-shrink: 0;
}

.navigation__item {
    margin: .5em 0;
}

.navigation__item.active {
    font-weight: bold;
}

.navigation__item > a {
    color: #000;
    text-decoration: none;
}

.navigation__item > a:hover {
    text-decoration: underline;
}

.navigation__section {
    list-style-type: none;
    font-size: 0.9em;
    margin-left: 1em;
}

.navigation__section.navigation__section--level-0 {
    font-size: 1em;
    margin: 2em 0 0 1em;
}

.navigation__toggle {
    display: none;
}

@media (max-width: 800px) {
    .content-container {
        display: block;
    }

    .navigation {
        position: relative;
        top: 0;
        width: 100%;
        height: auto;
        min-width: auto;
        max-width: 100%;
        font-size: 1.2em;
    }

    .navigation__toggle {
        display: block;
        text-align: center;
        cursor: pointer;
        background: #eee;
        padding: 0.2em;
        margin: 0.5em;
    }

    .navigation__section.navigation__section--level-0.active {
        display: block;
        z-index: 1;
    }

    .navigation__section.navigation__section--level-0 {
        display: none;
        padding: 0 1em;
        margin-top: 0;
        margin-left: 0;
        top: 0;
        background: #fff;
    }

    .navigation__section {
        font-size: 0.9em;
        margin-left: 1em;
    }
}