JSFiddle - React, Tailwind, and code Playground

HTML

<div id="div1">
    <div id="div2">
        <!--BLUB-->
    </div>
</div>

CSS

#div1
{
  width:200px;
  height:200px;
  border:1px solid black;
  margin-left:auto;
  margin-right:auto;
}
#div2
{
  width:100px;
  height:100px;
  border:1px solid red;
}