P2 Bigger font for single post

previously i was using SVN version of this theme, and today the official release here is very tricky than that.. i noticed it’s using entry.php earlier there was only single.php anyway… i want to show postcontent in bigger size in single post i defined extra class postcontent2 with bigger text size however if i change entry.php to poscontent2 class it make both home pages entries size big too.. i copied/pasted entry.php to entry1.php and defined postcontent2 in it and in single post i changed /entry1.php it’s working.. but my point is it the right fax to achieve that i want to have big font size for single post content item only … you can have a look at my blog https://trendblog.org to see what i meant..