How can I add a line between two columns using Twitter Bootstraps grid system

My solution uses the :before pseudo-element to put a positioned element between the columns. This doesn’t require any more HTML elements and will just be applied to immediate child .col-* elements of the .border-between class. This should be applied to the same element as the .row.

HTML

<div class="row border-between">
  <p class="col-sm-6">This column does not have a border, because it's a first child.</p>
  <p class="col-sm-6">This column has a border to the left</p>
</div>

CSS

.border-between > [class*='col-']:before {
   background: #e3e3e3;
   bottom: 0;
   content: " ";
   left: 0;
   position: absolute;
   width: 1px;
   top: 0;
}

.border-between > [class*='col-']:first-child:before {
   display: none;
}