Butterbeer: Highlighted logo

I worked out what was missing from the design! It looked too flat with just the two colours so I added another to highlight the logo and the shield to make them look a little bit shinier and a little bit more 3D, like the were embossed or something. This looks much better already and it makes it look like the line is actually dripping and is melted. That's the look that I was going for and I think adding the highlight managed to nail the point home.