JSFiddle - React, Tailwind, and code Playground

HTML

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8" />
<title>Insert title here</title>
<style type="text/css">
.l-wrapper {
background-color: black;
}

.l-content {
background-color: red;
    margin-left: 200px;
}

.l-sidebar {
background-color: blue;

    float: left;
    width: 200px;
}
         
</style>
</head>
<body>
        <div class="l-wrapper">

                <div class="l-sidebar">
                <br /><br /><br /><br /><br /><br /><br /><br /><br />
                <br /><br /><br /><br /><br /><br /><br /><br /><br />          
                </div><!-- l-sidebar -->



                <div class="l-content">         
                        <div style="float: left; background-color: white;">——--</div>
                        
                        <div style="clear: both; background-color: green;">sdfsdfsdf</div>
                </div><!-- l-content -->

        </div><!-- l-wrapper -->
</body>
</html>