Woo Commerce CSS

Hi there,

SO i am having some trouble editing Woo Commerce.

I prefer using the Woo Commerce CSS but how can i change parts of it?

I found a help topic that Woo Commerce posted but I do not quite know how to apply it.

Basically how do I over write the plugs CSS in my themes style sheet?

For example:

http://www.lovemrdarcy.com/product/roses/

The product first class I want to change from 48% to 22%.

and

The dropdown menu is outside my main container. How would I make it come inside the container?

Cheer,

Stuart