When you try to comment a activity you can't write more then some words. The box will no to grow with the text, and if you try to force manually you will see a crappy.
Solution: Try to use a script a script already used on Noosfero to grow up textareas with its content or a jQuery plugin. Place the picture background with absolute px and not with percentage or some relative named position, like middle.
-- AurelioAHeckert -- 10 Aug 2012
-- DanielaFeitosa - 17 Aug 2012