IMCB. -->
<div class="container">
  <div class="item" style="left: -10px; right: -20px;" data-offset-x="45">
    <div class="inner"></div>
  </div>
</div>

<!-- No overflow, centered in IMCB. -->
<div class="container">
  <div class="item" style="left: -10px; right: -20px;" data-offset-x="-5">
    <div class="inner" style="width: 120px;"></div>
  </div>
</div>

<!-- Overflows strong CB edge, shifted. -->
<div class="container">
  <div class="item" style="left: -10px; right: -20px;" data-offset-x="-40">
    