Why isn't the white board function and background size cover working?

Question

https://code.sololearn.com/W5qpe0TqeJn7/?ref=app

Answer 1

but it is failing to recognise any functions in the code

Answer 2

Change dialog to div tag
Delete all all dummy characters "-" on HTML codes
And Javascript cannot access ul tag

Properly format your codes with proper indentation

https://code.sololearn.com/WY3F5m85HY9a/?ref=app

Answer 3

Bithi D Please check again

Answer 4

why isn't the home function working?

Answer 5

Added left:0 on #home css

Answer 6

And when I open anything, the home button is disappearing