JSFiddle - React, Tailwind, and code Playground

HTML

<div class="outer">
  <div>
    test1
    <br/> test1
    <br/> test1
  </div>
  <div>
    test2
    <br/> test2
    <br/> test2
  </div> 
</div>

CSS

.outer {
  background-color: #ff00ff;
  width: 100%;
}

.outer div {
  float: left;
  background-color: #0000ff;

}