JSFiddle - React, Tailwind, and code Playground

HTML

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

CSS

.parent { position: relative; height: 400px; width: 300px; background: blue;}
.button { position: absolute; top: 45%; right: -100px; width: 100px; height: 45px; background: red; }