c-banner

Code 
<div class="c-banner">
    <div id="div-gpt-ad-1536231556476-0" style="width: 500px; height: 175px;">…</div>
</div>

c-banner c-banner--sticky

Code 
<div class="c-banner c-banner--sticky">
    <div id="div-gpt-ad-1536231556477-0" style="width: 250px; height: 300px;">…</div>
</div>