JSFiddle - React, Tailwind, and code Playground

HTML

<div id="mention">

	<div id="left">
	</div>

	<div id="right">
	</div>

</div>

CSS

#mention {

	background-color : yellow;
    padding : 15px;
}



#left {
	float : left;
	width : 48%;
	height : 500px;
        background-color : red;
}

#right {
	float : right;
	width : 48%;
	height : 500px;
    background-color : blue;
}

#mention:after {
  content: "";
  display: table;
  clear: both;
}