JSFiddle - React, Tailwind, and code Playground

HTML

<div class="main">
         <div class="left">
                <h2>Some text.</h2>  
         </div>
         
         <div class="right"></div>
         

    </div>

CSS

.left {

    width:300px;
    height:300px;
    background-color:red;
    display: inline-block;
    vertical-align: top;
}

.right {
    width:300px;
    height:300px;
    background-color:blue;
    display: inline-block;
    vertical-align: top;
}