grey"></span>
                    </div>
                </div>
            </article>
            
            <article class="box">
                <header class="box__header"><h2>Thumbnails</h2></header>
                <div class="box__content">
                    <div class="thumbnail thumbnail--small mr2">
                        <img src="https://picsum.photos/300/300?image=10" alt="">
                    </div>
                    <div class="thumbnail thumbnail--medium mr2">
                      