Change in front-end

I have added an attribute to some of the items I'm selling (as drop-down). Now, I need to modify their color/style and etc. Where can I apply changes to?

Do I need to modify master file or ... ?

Thanks,

Look at Product Attributes.
A

I already did. Maybe I have not been clear ... so what I'm trying to say is that I created a product attribute as you pointed out as drop-down. Now, I need to work on the drop-down style since it is thin and small.

Any idea?

Look in modules\productvariantsingrid.ascx where you will see a <div> that has class=attributes assigned to it. This div loads the modules\productattributes.ascs server control...jeff