@collab-ui/core/scss/components/popover/examples/contained.html

Cisco Collab UI CSS Framework

<div class="cui-event-overlay cui-event-overlay--arrow cui-event-overlay--bottom">
  <div class="cui-event-overlay__arrow" style="left: 321px; top: 355px;"></div>
  <div class="cui-event-overlay__children" style="overflow: auto; top: 355px; left: 229px; bottom: 0px;">
    <span style="height: 3000px;">Popover(height: 3000px)</span>
  </div>
</div>