JSFiddle - React, Tailwind, and code Playground

HTML

<div class="container">
    <div class="button">
        <button class="btn btn-default">button</button>
    </div>
    <img src="https://png.pngtree.com/thumb_back/fh260/back_pic/02/65/14/5957873074946eb.jpg" style="width: 100%;" />
</div>

CSS

.button {
    position: absolute;
    left: 75%;
    top: 75%;
}
.container {
  position: relative;
}