Customizing product page info

[Mikado]

I am trying to customize my info page produced by fiddling tpl_product_info_display.php
My problem is that I do not find the file CSS which contains the classes productGeneral, productGeneral biggerText, floatingBox back, buttonRow back, etc....
I find nothing of all this in/includes/templates/template_default/css/stylesheet.css

[stevesh]

Any time you find an id or class that you want to style, but it isn't currently in the stylesheet, you can add it yourself. I usually try to add the element near other similar ones, but usually it will work if you just add it to the bottom of the stylesheet.