add different stylesheet file to edit themes file list [duplicate]

See this answer.

The theme editor has support for files in a subdirectory – but only if
this is the main theme and only for PHP files. This seems to be an
omission, I opened a ticket for it.

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