title: video.js responsive not working
body: <p>I have been using video.js for a while and was looking for a responsive solution. I saw that 4.6 claimed to be so but cannot get to work. And I find nothing in the documentation about making it responsive. I basically just need it to stay at 100% of the container and maintain its aspect ratio. If I leave the width/height off it defaults small. 100% will work on width but not sure what to put for height. Tried to use CSS on the id of the video tag, didn't work.</p>
  
  <p>The daverupert.com method works for the older version of video.js but would not work with 4.6.</p>
  
  <p>If it is documented somewhere a link would be helpful or any ideas on how someone else has made video.js 4.6 responsive.</p>
  
  <p>Also, the loading animation is not showing.</p>