Custom Product Page Layout - can't find elements in css to change look & feel

I am making some major changes to the layout of my product pages. First all of my products will be priced by attributes, and using the DPU price updater, I wanted the attributes to be neatly organized inside of the AddCart box along with the calculated price. So I got the attributes moved to inside the AddCart box like I wanted by moving the BOF/EOF content lines for Attributes on the tpl_product_info_display.php file, but I am having difficulty in finding the elements in my css file to make the rest of the appearance changes.

If you look in the screen shot in the red circle I want to change the option names so that they are right above the drop down menu (not side by side) and also I want all of my drop down menus to be the same width. And there is too much vertical spacing between each product option. I also want to add some color to the box or possible a background image (which I am sure is css). I just can't seem to find any elements in the css to do all this, or should some or all of these changes be done in a php file?

Here is an example of how I want my attributes to look inside of the CartAdd box:

I appreciate any help on this...
John