body {
    margin: 0;
    overflow: hidden;
    background: black;
    color: white;
}

#content {
    position: absolute;
    left: 0; right: 0; top: 0; bottom: 0;
    display: flex;
    flex-direction: row;
}

#left {
    flex: 1 1 auto;
    display: flex;
    flex-direction: column;
}

#video {
  background: gray;
  overflow: hidden;
  /*width: 480px;*/
  /*height: 270px;*/
  /* https://css-tricks.com/aspect-ratio-boxes/ */
  /* height + padding-top = 16:9 */
  height: 0;
  padding-top: 56.25%;
/*  flex: 1 1 auto;
*/  position: relative;
}
#video .content {
  position: absolute;
  top: 0; left: 0;
  width: 100%;
  height: 100%;
}
video {
  width: 100%;
  height: 100%;
}

#blabla {
  /*width: 480px;*/
  flex: 1 1 auto;
}

#pad {
    flex: 1 1 auto;
}

#pad iframe {
    width: 100%;
    height: 100%;
}