<div class="container">
  <h1>Easily embed YouTube or Vimeo videos in Bootstrap</h1>
  <p>Bootstrap comes with a nice helper classes to responsively embed videos on your website.</p>
  <p class="text-muted">This pen is a part of the <a href="https://bootstrapious.com/p/bootstrap-tips-and-tricks" target="_blank">Bootstrap tips and tricks article</a>.</p>
  
  <div class="row">
    <div class="col-sm-6">
      <!-- 16:9 -->
      <h4>16:9 Aspect Ratio</h4>
      <div class="embed-responsive embed-responsive-16by9">
        <iframe class="embed-responsive-item" src="//www.youtube.com/embed/zB4I68XVPzQ"></iframe>
      </div>
    </div>
    <div class="col-sm-6">
      <!-- 4:3 -->
      <h4>4:3 Aspect Ratio</h4>
      <div class="embed-responsive embed-responsive-4by3">
        <iframe class="embed-responsive-item" src="//www.youtube.com/embed/zB4I68XVPzQ"></iframe>
      </div>
    </div>
  </div>
</div>
Rerun