JSFiddle - React, Tailwind, and code Playground

HTML

<div class="wrapper">
  <div class="block">111 </div>
  <div class="block">222 </div>
 
</div>

CSS

.wrapper {
  display:flex;
}

.block {
  border:1px solid black;
  min-height:200px;
  flex-grow:1;
}