JSFiddle - React, Tailwind, and code Playground

HTML

<form action="/">
    <div class="form-row">
        <input class="inp-txt" type="text" placeholder="Search">
        <button class="btn-submit"></button>
    </div>    
</form>

CSS

.form-row {
    position: relative;
    margin: 50px;
}

.inp-txt {
    width: 100%;
    
    -moz-box-sizing: border-box;
    box-sizing: border-box;
    
    padding: 8px 42px 8px 12px;
    
    border-radius: 14px;
    border: 1px solid #ccc;
}

.btn-submit {
    width: 30px;
    
    position: absolute;
    top: 2px;    right: 2px;
    bottom: 2px;
    
    background: #333;
    border-radius: 0 14px 14px 0;
    border: none;
    cursor: pointer;
}