Lergo-450,452, Lergo-279 review comments

1. I don't feel so good about the lighter background for question, more
in play lesson.  The reason it was OK for the lesson intro to have light
background is because the image of video itself is a very clear
rectangular. 
I suggest to either have a thin darker frame, as you did for lesson
preview (see attached), or to have the background in darker color (same
color as the thin frame is now).

2. While the number counter of lessons next to icons is for any lesson
used (as it is now), the list of question is used in lessons should
contain only public lessons. Right now I saw it contains also lessons
that are not public and it should not.