div wrapper

by weijarz

HTML

<div class="a">
  <div class="b">
    B
  </div>
</div>

CSS

.a {
  position: absolute;
  border: 5px dashed red;
}
.b { 
  width: 10rem;
  height: 10rem;
  position: absolute;
  background: #ccc;
  
}