Is it Sunnah for the lid of the deceased's coffin to be open or closed when praying over him in the mosque, while he is enshrouded inside it?

Scholars have differed concerning offering the funeral prayer in the mosque, but the preponderant opinion is that it is permissible. Burying the deceased in a coffin is unanimously disliked, except in wet or loose ground. It is preferable to leave the deceased male without a covering, while it is recommended to cover the female. The prayer over the deceased is valid, whether the deceased is in a coffin or not, and whether covered or not.