JSFiddle - React, Tailwind, and code Playground

HTML

<style>
#elso { 
border: 1px solid black; 
width: 200px;
height: 200px;
}

#masodik { 
border: 1px solid black; 
width: 100px;
height: 100px;
float: right;
}
</style>

<div id="elso">
  <div id="masodik">
  </div>
</div>