Change retailer link and background colors in Retailers layout (Boutiques)

To further align your Retailers Boutique layout with your existing blog brand identity, you may wish to alter the color of the links in the Retailers box at the top of the page. This Code Hack is for customers using this specific layout in one of their Boutiques (called the "Retailers Layout" in the Page Attributes dropdown).

Note: You can delete any parts of the code that you don't wish to alter on your own site (for example, if you only want to change the background color, look for the comments in the code that point out which pieces do this. Copy and paste only those parts!)

Here is what this Code Hack looks like in action:

And here is the code you need to achieve it!