>
    <div class="inner" style="height: 80px;"></div>
  </div>
</div>

<!-- Overflows weak CB edge, shifted. -->
<div class="container">
  <div class="item" style="top: 20px; bottom: 10px;" data-offset-y="5">
    <div class="inner" style="height: 95px;"></div>
  </div>
</div>

<!-- Overflows strong CB edge, shifted. -->
<div class="container">
  <div class="item" style="top: 20px; bottom: 10px;" data-offset-y="0">
    <div class="inner" style="height: 120px;"></div>
  </div>
</div>

<!-- No overflow, center