JSFiddle - React, Tailwind, and code Playground

HTML

<div class="outside">
    <input class="inside"/>
</div>

CSS

.outside{
    width: 100px;
    height: 100px;
    background: red;
}
.inside{
    width: 100%;
    padding: 10px;
    background: blue;
    border: none;
}