TinyMCE垂直扩展

last night I applied a new style on my webpage but my TinyMCE textarea editor expanded too much .. i dont know where is the error I checked the new styling code and there were no conflict because i didnt put any style for .
I tried to delete single styling block at a time to check if there was a conflict but nothing worked.

this is the image of the expanded editor!
http://i.stack.imgur.com/Y4bqZ.png

Regards,