title: Add border lines to bootstrap grid
body: <p><img src="https://i.stack.imgur.com/vou56.png" alt="enter image description here">enter image description hereI have a grid created using class col-md-3 which have 3 columns:</p>
  
  <pre><code>&lt;div ng-repeat='(key, value) in permissionsViewContent' class="row"&gt;
      &lt;div class="tree_content_permissions_title"&gt;
          &lt;span&gt; {{key}}&lt;/span&gt;
      &lt;/div&gt;
      &lt;div ng-repeat="val in value"
          class="col-md-3 tree_content_permissions"&gt;
          &lt;label class="checkbox"&gt; &lt;input type="checkbox"&gt; 
              {{val}}
          &lt;/label&gt;
      &lt;/div&gt;
  &lt;/div&gt;
  </code></pre>
  
  <p>this grid created from a list of values. I want my grid to have border line after each row in my grid. How can I do it using css?</p>
  
  <p>Thanks,</p>