Block indentation using CSS classes

This is a normal paragraph with no indentation applied.

This heading has the .custom-block-indent-a class

This paragraph shares the same class and that puts it at the same level.

But this one has the .custom-block-indent-b class

This paragraph shares the same indentation class.

This paragraph has the .custom-block-indent-c class. This is the maximum indentation level allowed in the configuration.