Bootstrap 5 Responsive Audio Tag

<!DOCTYPE html>
<html lang="en">
  <head>
    <title>Bootstrap Example</title>
    <meta charset="utf-8" />
    <meta name="viewport" content="width=device-width, initial-scale=1" />
    <link
      href="https://cdn.jsdelivr.net/npm/bootstrap@5.3/dist/css/bootstrap.min.css"
      rel="stylesheet"
    />
    <script src="https://cdn.jsdelivr.net/npm/bootstrap@5.3/dist/js/bootstrap.bundle.min.js"></script>
  </head>
  <body>
    <div class="container">
      <div class="card mt-4">
        <div class="card-header">HTML5 Audio Player Example</div>
        <div class="card-body">
          <audio controls>
            <source
              src="https://interactive-examples.mdn.mozilla.net/media/cc0-audio/t-rex-roar.mp3"
              type="audio/mpeg"
            />
            <source
              src="https://interactive-examples.mdn.mozilla.net/media/cc0-audio/t-rex-roar.ogg"
              type="audio/ogg"
            />
            <source
              src="https://interactive-examples.mdn.mozilla.net/media/cc0-audio/t-rex-roar.wav"
              type="audio/wav"
            />
            Audio not supported
          </audio>
        </div>
      </div>
    </div>
  </body>
</html>

How can I make the audio tag in Bootstrap card 100% width of the parent element by bootstrap 5 classes? Adding style="width:100%" works but I want to know how is it done by bootstrap way.

Solution

Simple, just try add w-100 in class attribute of <audio> tag.

<audio controls class="w-100"></audio>

<!DOCTYPE html>
<html lang="en">
  <head>
    <title>Bootstrap Example</title>
    <meta charset="utf-8" />
    <meta name="viewport" content="width=device-width, initial-scale=1" />
    <link
      href="https://cdn.jsdelivr.net/npm/bootstrap@5.3/dist/css/bootstrap.min.css"
      rel="stylesheet"
    />
    <script src="https://cdn.jsdelivr.net/npm/bootstrap@5.3/dist/js/bootstrap.bundle.min.js"></script>
  </head>
  <body>
    <div class="container">
      <div class="card mt-4">
        <div class="card-header">HTML5 Audio Player Example</div>
        <div class="card-body">
          <audio controls class="w-100">
            <source
              src="https://interactive-examples.mdn.mozilla.net/media/cc0-audio/t-rex-roar.mp3"
              type="audio/mpeg"
            />
            <source
              src="https://interactive-examples.mdn.mozilla.net/media/cc0-audio/t-rex-roar.ogg"
              type="audio/ogg"
            />
            <source
              src="https://interactive-examples.mdn.mozilla.net/media/cc0-audio/t-rex-roar.wav"
              type="audio/wav"
            />
            Audio not supported
          </audio>
        </div>
      </div>
    </div>
  </body>
</html>