#interactive.viewport {
  width: 75%;
}

#interactive.viewport canvas, video {
  float: left;
  width: 75%;
}

#interactive.viewport canvas.drawingBuffer, video.drawingBuffer {
  margin-left: -640px;
}


@media (max-width: 603px) {

  #interactive.viewport {
    width: 100%;
  }

  #interactive.viewport canvas, video {
    float: left;
    width: 100%;
  }

  #interactive.viewport canvas.drawingBuffer, video.drawingBuffer {
    margin-left: -640px;
  }


}