Change log

A new variation was added where the sentences are not changing, but the whole transcript is visible, scrollable.
When the video is playing, the scroll bar follows the highlighted text.

The [zoom+] and [zoom-] buttons were replaced by a slider. The slider also allows a deeper (up to 30x) zoom.

The [play/stop] button was replaced by [play/pause]+[stop] buttons.

The font style and the position was changed. Now it is more dominant, being in the middle with bigger font size and brighter font colour.