JSFiddle - React, Tailwind, and code Playground

HTML

<div id="main">
    <div>
      C1
    </div>
    <div>
      C2
    </div>
    <div>
      C3
    </div>
</div>

CSS

#main {
    margin: 0 50px;
    background-color: cyan;
    overflow: auto;
}

#main div {
   float: left;
   height: 100px;
   width: 33.3%;
}