Answer 1

When you want to control more things by one button then for it will be needed saving of state. For example in this way:

https://code.sololearn.com/WQ9Emp5847lw/?ref=app

Answer 2

This can you set in css part.

Answer 3

Happy coding!

Answer 4

The example is working. This is only problem of playground editor.
You can check the code again. I have copied the js part into html.
Now should it also work in your web editor.

Answer 5

https://www.sololearn.com/compiler-playground/W9nAzMf7zwaG