Change boutique link, background and retailer link colors in Instashop layout (Boutiques)

To further align your Instashop Boutique with your existing blog brand identity, you may wish to alter the colors in the sidebar box on the left side of the page template. The Code Hack below allows you to alter the sidebar box background color, link colors, title color, as well as the color of the small border separating the Boutiques links and Retailers links. This Code Hack is specifically for customers using this layout of our Boutiques plugin (called the "Instashop 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's what this Code Hack looks like in action:

And here's the code you need to do it: