<div class="pb-list_item">
            <div class="pb-list_header">Expandable - click to reveal content</div>
            <button>
<svg viewbox="-4 -4 32 32" class="pb-icon
 pb-icon--expandable
">
    <use xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="svg/gui.svg#pb-icon_keyboard_arrow_down"/>
</svg>
</button>
        </div>
        <div class="pb-expandable">
            [some content ...]
        </div>