Change horizontal module color and text

hi, I wish to change the color of the horizontal dropdown module for green and the text for white and I don't know how to do it.
Thank you for your help.

Hi

Such changes are categorized as customization and we do not support. But it's really easy. Please install Firebug. This is a plugin for Firefox. With this You can make some changes on the live site and see which files should be edited.