<div class="container">
  <div class="row">
    <div class="col">1列目</div>
    <div class="col">2列目</div>
    <div class="w-100"></div>
    <div class="col">3列目</div>
    <div class="col">4列目</div>
  </div>
</div>

.row > [class*=col] {
    padding-top: .75rem;
    padding-bottom: .75rem;
    background-color: rgba(86,61,124,.15);
    border: 1px solid rgba(86,61,124,.2);
}

.row {
  margin-top: 1rem;
}