JSFiddle - React, Tailwind, and code Playground

HTML

<div class="container">
    <div class="block">
        <div class="col left">
             <h1>Left</h1>

        </div>
        <div class="col right">
             <h1>Right</h1>

        </div>
        <div class="clear"></div>
    </div>
</div>

CSS

div {
    margin: 0;
    padding: 0;
}
.container {
    background: #DDD;
    width: 1200px;
    margin: 0 auto;
    padding: 2% 0;
}
.block {
    background: #555;
    width: 100%;
    display: block;
}
.col {
    width: 50%;
    float: left;
    box-sizing: border-box;
    background: #333;
}
.clear {
    clear:both;
}