<link href="//maxcdn.bootstrapcdn.com/bootstrap/4.1.1/css/bootstrap.min.css" rel="stylesheet" id="bootstrap-css"> <script src="//maxcdn.bootstrapcdn.com/bootstrap/4.1.1/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="container"> <div class="row"> <div class="col-md-6" style="background-color: red">БЛОК 1</div> <div class="col-md-6" style="background-color: green">БЛОК 2</div> </div> <div class="row"> <div class="col-md-12" style="background-color: blue">БЛОК 12</div> </div> </div>