title: How can i apply to all of them (childs) a bootstrap element?
body: <p>i would like to apply this class to all childs elements</p>
  <pre><code>&lt;div class=&quot;bg-dark&quot;&gt;
      &lt;div class=&quot;row mt-5&quot;&gt;
      &lt;/div&gt;
     &lt;div class=&quot;row mt-5&quot;&gt;
      &lt;/div&gt;
     &lt;div class=&quot;row mt-5&quot;&gt;
      &lt;/div&gt;
  </code></pre>
  <p>when i applied bg-dark those divs are not dark colors, how can i apply to all of them?</p>