JSFiddle - React, Tailwind, and code Playground

HTML

<div class="parent">
  <div class="floater"></div>
  <div class="sub">sub content</div>
</div>

CSS

.parent{
  height: 250px;
  border: 1px solid;
}
.floater{
  float: left;
  height: 50%;
  width: 100%;
  margin-bottom: -40px;
}  
.sub {
  clear: both;
  height: 80px;
  border: 1px solid red;
}