<div class="container">
  <h1>
    Bootstrap equal width columns demo
  </h1>
  
    <div class="row">
    <div class="col">
      col
    </div>
    <div class="col">
      col
    </div>
  </div>
  
  <div class="row mt-5">
    <div class="col">
      col
    </div>
    <div class="col">
      col
    </div>
    <div class="col">
      col
    </div>
  </div>
  
    <div class="row mt-5">
    <div class="col">
      col
    </div>
    <div class="col">
      col
    </div>
    <div class="col">
      col
    </div>
    <div class="col">
      col
    </div>
  </div>
</div>

<script src="https://code.jquery.com/jquery-3.3.1.slim.min.js" integrity="sha384-q8i/X+965DzO0rT7abK41JStQIAqVgRVzpbzo5smXKp4YfRvH+8abtTE1Pi6jizo" crossorigin="anonymous"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/popper.js/1.14.3/umd/popper.min.js" integrity="sha384-ZMP7rVo3mIykV+2+9J3UJ46jBk0WLaUAdn689aCwoqbBJiSnjAK/l8WvCWPIPm49" crossorigin="anonymous"></script>
<script src="https://stackpath.bootstrapcdn.com/bootstrap/4.1.3/js/bootstrap.min.js" integrity="sha384-ChfqqxuZUCnJSK3+MXmPNIyE6ZbWh2IMqE241rYiqJxyMiZ6OW/JmZQ5stwEULTy" crossorigin="anonymous"></script>
.row div {
  border: 1px solid;
}

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