JSFiddle - React, Tailwind, and code Playground

HTML

<div class="block">
    <input type="text" size="20">
</div>

CSS

.block {
    width: 300px;
    height: 300px;
    background: lightgray;
    margin: 0 auto;
}

input[type="text"] {
    width: 100%;
    height: 100%;
}