JSFiddle - React, Tailwind, and code Playground

HTML

<div class="parent">
  <div class="mydiv"></div> 
</div>

CSS

.parent{
    width:150px;
    height:150px;
}
.mydiv
    {
    position:relative;
    background-color:red;
    min-width:150px;
    min-height:150px;
}