title: iframe Youtube video not displaying
body: <p>Update: I just tried opening the files in Chrome instead of Firefox.  The video appears in Chrome, but not Firefox.  Does anyone know why?</p>
  
  <p>I am a beginning website designer trying to embed a youtube video in my webpage, but for some reason it is not showing up.  There is a ghost object taking up the same amount of space as the video would, but the video itself is not showing.  I have researched how to embed videos, and I do not understand why it's not working.  Any tips are appreciated!</p>
  
  <p>HTML:</p>
  
  <pre><code>&lt;iframe class="video" width="560" height="315" src="https://www.youtube.com/embed/oTSGrL04wwU?rel=0" frameborder="0" allowfullscreen&gt;&lt;/iframe&gt;
  </code></pre>
  
  <p>CSS:</p>
  
  <pre><code>iframe.video{
      position: relative;
      left: 260px;
      padding: 20px;}
  </code></pre>