JSFiddle - React, Tailwind, and code Playground

HTML

<div>
    <span class="btn">
        <span></span>
    </span>
    <input type="text" />
</div>

CSS

div {
    position: relative;
    width: 180px;
    border: 1px solid #ddd;
    margin: 20px;
    height: 30px;
}

div input {
    padding: 6px;
}

.btn {
    position: absolute;
    height: 30px;
    width: 30px;
    background: #aaa;
    right: 0;
    top: 0;
}