JSFiddle - React, Tailwind, and code Playground

HTML

<form method="post">
    <label>Label</label>
    <button>Button</button> 
    <span><input type="text"/></span>
</form>

CSS

form {
    display: block;
    padding: 1em;
}
label {
    float: left;
    line-height: 2em;
}
button {
    float: right;
    line-height: 1.5em;
    margin: 0;
    background: #eee;
    border: 1px solid #aaa;
    border-radius: .2em;
}
span {
    display: block;
    overflow: hidden;
    padding: 0 1em;
}
input {
    width: 100%;
    font-size: 1em;
    height: 1.5em;
    line-height: 1.5em;
}