JSFiddle - React, Tailwind, and code Playground

by niks999

HTML

<div class="parent">
        <div class="child">
           <!-- just blank div -->
        </div>
    </div>

CSS

.parent {
   background: #eee;
   width: 400px;
   height: 300px;
   border: 1px solid #000;
}

.child {
   width: calc(100%-20px);
   height: 100%;
   background: red;
   margin-left: 20px;
}