JSFiddle - React, Tailwind, and code Playground

HTML

<h1>Con botones</h1>

<div>
    <button>si</button>
    <button>no</button>
    <div class="contenedor">
        <input type="text">
    </div>
</div>
 <h1>Sin botones <small>(misma estructura)</small></h1>

<div>
    <div class="contenedor">
        <input type="text">
    </div>
</div>

CSS

button {
    float: right;
}
input {
    width: 100%;
}
.contenedor {
    overflow: hidden;
}