.video_elem { padding-right: 0; margin-left: auto; margin-right: auto; display: block; }
  /* the canvas *must not* have any border or padding, or mouse coords will be wrong */
  video.video_border { border: 0px none; background-color: white; }
  /* the canvas *must not* have any border or padding, or mouse coords will be wrong */
  video.video_elem { border: 0px none; background-color: white; }

  #output {
    width: 50%;
    height: 5em;
    font-size: 0.8em;
    margin: 0 auto;
    margin-top: 10px;
    border-left: 0px;
    border-right: 0px;
    padding-left: 0px;
    padding-right: 0px;
    display: block;
    background-color: white;
    color: black;
    font-family: 'Lucida Console', Monaco, monospace;
    outline: none;
  }