JSFiddle - React, Tailwind, and code Playground

HTML

<div class="container">
<div class="div-submit">
		<input type="submit" value="Post">
	</div>
    <div class="div-textarea">
	    <textarea id="txtarea" placeholder="This  is a textarea"></textarea>
	</div>
</div>

CSS

.container{
    background-color: green;
}

.div-textarea{
    background-color: blue;
Overflow:hidden;
}

.div-submit{
    float: right;
    background-color: red;
}