JSFiddle - React, Tailwind, and code Playground

HTML

<script src="http://netdna.bootstrapcdn.com/bootstrap/3.0.0/js/bootstrap.min.js"></script>
<link rel="stylesheet" href="http://netdna.bootstrapcdn.com/bootstrap/3.0.0/css/bootstrap.min.css">
  <div class="container">
      <!-- Example row of columns -->

     <div class="row">
         <div class="col-md-1"><div class="content"></div></div>
         <div class="col-md-1"><div class="content"></div></div>
         <div class="col-md-1"><div class="content"></div></div>
         <div class="col-md-1"><div class="content"></div></div>
         <div class="col-md-1"><div class="content"></div></div>
         <div class="col-md-1"><div class="content"></div></div>
         <div class="col-md-1"><div class="content"></div></div>
         <div class="col-md-1"><div class="content"></div></div>
         <div class="col-md-1"><div class="content"></div></div>
         <div class="col-md-1"><div class="content"></div></div>
         <div class="col-md-1"><div class="content"></div></div>
         <div class="col-md-1"><div class="content"></div></div>

     </div>

    <div class="row">
        <div class="col-md-2"><div class="content"></div></div>
        <div class="col-md-2"><div class="content"></div></div>
        <div class="col-md-2"><div class="content"></div></div>
        <div class="col-md-2"><div class="content"></div></div>
        <div class="col-md-2"><div class="content"></div></div>
        <div class="col-md-2"><div class="content"></div></div>


    </div>


    <div class="row">
        <div class="col-md-3"><div class="content"></div></div>
        <div class="col-md-3"><div class="content"></div></div>
        <div class="col-md-3"><div class="content"></div></div>
        <div class="col-md-3"><div class="content"></div></div>



    </div>

    <div class="row">
        <div class="col-md-4"><div class="content"></div></div>
        <div class="col-md-4"><div class="content"></div></div>
        <div class="col-md-4"><div...

CSS

.content{
    width:100%;    
    height: 60px;
    background-color:black;
}

.row{    
    background-color: orange;    
}