title: vimeo background video is not playing in chrome
body: <p>I have added vimeo video as background.
  This video playing automatically in <strong>firefox</strong> and <strong>IE</strong> but not <strong>chrome</strong> and <strong>safari</strong>.</p>
  
  <p>This is my HTML</p>
  
  <pre><code>&lt;section id="intro"&gt;
  &lt;/section&gt;
  </code></pre>
  
  <p>This is my CSS</p>
  
  <pre><code>#intro {
  width: 100%;
  height: 700px;
  background: linear-gradient(45deg, rgba(0, 150, 200, 1), rgba(0, 100, 200, 0.4)), url(https://player.vimeo.com/video/188755936) center top no-repeat fixed;
  background-size: cover;
  position: relative;
  </code></pre>
  
  <p>Here is my domain. <a href="https://www.appail.com/" rel="nofollow noreferrer">https://www.appail.com/</a></p>
  
  <p>and here is attached screenshot to check my css.</p>
  
  <p><a href="https://i.stack.imgur.com/i1Khm.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/i1Khm.png" alt="enter image description here"></a></p>