<link href="//maxcdn.bootstrapcdn.com/bootstrap/4.0.0/css/bootstrap.min.css" rel="stylesheet" id="bootstrap-css"> <script src="//maxcdn.bootstrapcdn.com/bootstrap/4.0.0/js/bootstrap.min.js"></script> <script src="//cdnjs.cloudflare.com/ajax/libs/jquery/3.2.1/jquery.min.js"></script> <!------ Include the above in your HEAD tag ----------> <div class="row"> <div class="col-md-6" style="height:100px;background-color:red;"></div> <div class="col-md-6" style="height:100px;background-color:blue;"></div> </div> <div class="row"> <div class="col-md-12" style="background:white;height:20px;"></div> </div> <div class="row"> <div class="col-md-6 romper-bootstrap" style="height:100px;background-color:red;"></div> <div class="col-md-6 romper-bootstrap" style="height:100px;background-color:blue;"></div> </div>

.romper-bootstrap { -webkit-box-sizing: content-box !important; -moz-box-sizing: content-box !important; box-sizing: content-box !important; }