<div class="Container">
   <div class="row">
      <div class="col-md-6">This is a row with 2 columns - Column 1 </div>
      <div class="col-md-6">This is a row with 2 columns - Column 2 </div>
   </div>
   <div class="row">
      <div class="col-md-4">This is a row with 3 columns - Column 1 </div>
      <div class="col-md-4">This is a row with 3 columns - Column 2 </div>
      <div class="col-md-4">This is a row with 3 columns - Column 3 </div>
   </div>
   <div class="row">
      <div class="col-md-3">This is a row with 4 columns - Column 1 </div>
      <div class="col-md-3">This is a row with 4 columns - Column 2 </div>
      <div class="col-md-3">This is a row with 4 columns - Column 3 </div>
      <div class="col-md-3">This is a row with 4 columns - Column 4 </div>
   </div>
</div>