content editor format style tags

In your source you allow only the selector tag p for the class – 'selector' => 'p',.

You find a longer answer with examples in this WPSE-Question. I think is not helpful to share the same content here in this question.

Hata!: SQLSTATE[HY000] [1045] Access denied for user 'divattrend_liink'@'localhost' (using password: YES)