1.  "Practice mistakes" doesn't work if you are not logged in. If this

is difficult to implement then I suggest to simply have a notification
"Please signup or login to LerGO. Only registered users can use this
feature".

3. Preview question - submit button is not centered above "please
answer" as it should in exact match question and open question - short
answer, and also in fill in the blanks question. See attached.

4. The text box for fill in the blank and exact match / open question
should be white/light gray inside as today in production build. See
attached. 
On 2nd thought I think that also the checkboxes for multiple choice
question and true/false question buttons, should have a lighter
gray/white color as the text boxes should have.  [note: I think
true/false buttons already have a lightly lighter color].
5. Preview for multiple question - the multiple choice answers are way
below the question and they should appear like in play lesson. See
attached.

6. Audio feedback: I don't hear a feedback when the answer is correct
(the previous feedback was removed which is good).
7. Color for lesson ending: - practice mistakes  icon orange Hex  F7941E
(if you need the color in RGB or HSV let me know) and for start over
icon green - 8CC63F  (see attached).

8. LERGO 440 - tested and headlines were removed. Please remove one line
spacing in lesson report above image/audio/picture (now there are 2 or 3
lines spaces in lesson report, if we can remove one of those lines it
will be better).