Highlighted menu item for call-to-action

Hi, I have the StoreFront Joomla 3.0 template. I would like to add a main menu item that has an orange background and white text - like the "Login" and "My Account" main menu items on the http://www.gavick.com website. How can I do this please ?

You would need to add a custom class to this menu position and use override.css to style it.