JSFiddle - React, Tailwind, and code Playground

HTML

<link rel="stylesheet" href="https://ajax.googleapis.com/ajax/libs/jqueryui/1.12.1/themes/smoothness/jquery-ui.css">
<link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.7/css/bootstrap.min.css">
<div class="row">

        <div class="product col-md-4 col-lg-4 col-sm-4 col-xs-4"></div>
        <div class="product col-md-4 col-lg-4 col-sm-4 col-xs-4"></div>
        <div class="product col-md-4 col-lg-4 col-sm-4 col-xs-4"></div>
        </div>
<div class="row">


            <div class="product col-md-4 col-lg-4 col-sm-4 col-xs-4"></div>
            <div class="product col-md-4 col-lg-4 col-sm-4 col-xs-4"></div>
            <div class="product col-md-4 col-lg-4 col-sm-4 col-xs-4"></div>
</div>
<div class="row">


        <div class="product col-md-4 col-lg-4 col-sm-4 col-xs-4"></div>
        <div class="product col-md-4 col-lg-4 col-sm-4 col-xs-4"></div>
        <div class="product col-md-4 col-lg-4 col-sm-4 col-xs-4"></div> 
       
  </div>
</div>

CSS

.product:nth-child(even){
  background: red;
  height:180px;
}

.product:nth-child(odd){
  background: green;
  height:180px;
}