JSFiddle - React, Tailwind, and code Playground

HTML

<div class="container">
	<div id="left">
		left
	</div>
    <input type="textbox" value="right" id="right" />
</div>

CSS

#left {
	display: table-cell;
	width: 180px;
	background-color:#ff0000;
}
#right {
    display: table-cell;
    width: 100%;
	background-color:#00FF00;
}
.container {
    display: table;
    width: 100%;
}