JSFiddle - React, Tailwind, and code Playground

HTML

<!doctype html>
<html>
    <head></head>
    <body>
        <div id="col1">
            content
        </div>
        <div id="col2">
            content
        </div>
    </body>
</html>

CSS

#col1 {
    display: inline-block;
    background-color: red;
    width:50%;
}

#col2 {
    display: inline-block;
    background-color: green;
    width:49%;
}