JSFiddle - React, Tailwind, and code Playground

HTML

<div>
    <input />
    <input type="button" va" />
</div>

CSS

div {
    width: 320px;
}

input {
    float: left;
    width: 100%;
    border: none;
    background: blue;
}
input[type=button] {
    width: 20%;
    border: none;
    background: red;
}