title: Change accordion button collapsed icon color in Bootstrap 5
body: <p>I am trying to change the Bootstrap 5's <a href="https://getbootstrap.com/docs/5.0/components/accordion/" rel="noreferrer">accordion's &quot;accordion-button&quot;</a> color when it is collapsed.</p>
  <p>I tried below. It changes the background but not the button's icon color.</p>
  <pre><code>.accordion-button.collapsed {
      color: white;
      background: blue;
  }
  </code></pre>
  <p>What should I do to change the down (collapsed) icon of the accordion for Bootstrap 5?</p>