Customizing a Superfish menu mostly involves writing your own CSS to style the menu the way you'd like. Here's how we'll create a custom look for the menu:
If you'll remember some web basics, you'll remember that CSS stands for Cascading Style Sheets. The cascading features are what we'll focus on here. Any styles we write for the top level of our menu are going to cascade down to the other levels of the menu. We have to remember that and handle all the cases where we'd rather stop a style from cascading downward.