JSFiddle - React, Tailwind, and code Playground

HTML

<div class="absolute">
    <div class="relative"></div>
</div>

CSS

.absolute{
    width:100px;
    height:100px;
    background-color:red;
    position:relative;
    margin-top:30px;
    margin-left:30px;
}

.relative{
    width:100%;
    height:100px;
    background-color:blue;
    position:absolute;
}