title: can I remove or change background color subtitle/webvtt in html5
body: <p>I want to remove or change the background of the subtitles. I've changed the background-color and background but it doesn't work. can the background change?</p>
  <pre><code>::cue {
    color: red;
    background-color: blue; //or background: blue;
  }
  </code></pre>
  <p>the subtitle color changes to red but the background doesn't change at all</p>