So for Prefixes and User banners, we do something very simple. We added style properties which overwrite the default styling of them so users can go and easily change colors on them. These can be disabled entirely to use the default styling of the banners.
We have a background color set, then we set a simple gradient/border-color/box-shadow(inset) based on that background.
You can go into any of these properties and adjust the look of them. Removing the entire "EXTRA" box for example would create flat prefix/banners.
The only reason your staff member looks a little more normal is because it's using your color palette. By using the color palette, it still adds the gradient and also the box-shadow inset (little tiny black line at the top below the top border) but your color palette is dark so it blends in better.
Light styles the prefix/userbanners get a darker border normally.
Dark styles get a lighter border normally.
This is simply because XenForo treats:
Code:
xf-intensify(@xf-xbPrefixGray--background-color, 20%)
Differently when using light/dark color option. I'm guessing this is what you mean by being "pressed in".
If you don't like the look of a specific prefix, just edit the property for it, it's really what it's there for.