title: How to remove border from elements in the last row?
body: <p>My layout is something like this (I'm typing a simplified version with inline styles instead of classes)</p>
  
  <p><div class="snippet" data-lang="js" data-hide="false" data-console="true" data-babel="false">
  <div class="snippet-code">
  <pre class="snippet-code-css lang-css prettyprint-override"><code>.qa {
    border-bottom: 1px solid #ccc;
  }</code></pre>
  <pre class="snippet-code-html lang-html prettyprint-override"><code>&lt;div style="display: flex; flex-wrap: wrap; flex-direction: row"&gt;
    &lt;div class="qa" style="width:50%;"&gt;
      &lt;div&gt;Question&lt;/div&gt;
      &lt;div&gt;Answer&lt;/div&gt;
    &lt;/div&gt;
    &lt;div class="qa" style="width:50%;"&gt;
      &lt;div&gt;Question&lt;/div&gt;
      &lt;div&gt;Answer&lt;/div&gt;
    &lt;/div&gt;
    &lt;div class="qa" style="width:50%;"&gt;
      &lt;div&gt;Question&lt;/div&gt;
      &lt;div&gt;Answer&lt;/div&gt;
    &lt;/div&gt;
    &lt;div class="qa" style="width:50%;"&gt;
      &lt;div&gt;Question&lt;/div&gt;
      &lt;div&gt;Answer&lt;/div&gt;
    &lt;/div&gt;
    &lt;div class="qa" style="width:50%;"&gt;
      &lt;div&gt;Question&lt;/div&gt;
      &lt;div&gt;Answer&lt;/div&gt;
    &lt;/div&gt;
    &lt;div class="qa" style="width:50%;"&gt;
      &lt;div&gt;Question&lt;/div&gt;
      &lt;div&gt;Answer&lt;/div&gt;
    &lt;/div&gt;
    &lt;div class="qa" style="width:50%;"&gt;
      &lt;div&gt;Question&lt;/div&gt;
      &lt;div&gt;Answer&lt;/div&gt;
    &lt;/div&gt;
    &lt;div class="qa" style="width:50%;"&gt;
      &lt;div&gt;Question&lt;/div&gt;
      &lt;div&gt;Answer&lt;/div&gt;
    &lt;/div&gt;
    &lt;div class="qa" style="width:50%;"&gt;
      &lt;div&gt;Question&lt;/div&gt;
      &lt;div&gt;Answer&lt;/div&gt;
    &lt;/div&gt;
    &lt;div class="qa" style="width:50%;"&gt;
      &lt;div&gt;Question&lt;/div&gt;
      &lt;div&gt;Answer&lt;/div&gt;
    &lt;/div&gt;
  &lt;/div&gt;</code></pre>
  </div>
  </div>
  </p>
  
  <p>This basically renders something like this:</p>
  
  <p><a href="https://i.stack.imgur.com/yUbXx.jpg" rel="noreferrer"><img src="https://i.stack.imgur.com/yUbXx.jpg" alt="enter image description here"></a></p>
  
  <p><strong>My questions is:</strong></p>
  
  <p><strong>How do I get rid of the border in the last row?</strong></p>