Dropdown Background colour 2.1 RC+

[lesmond]

Does anyone know where the blue rollover/hover background colours are defined for these dropdown boxes?

They are the same no matter what theme you use (or in my case try to make) and in all dropdown boxes

I have looked in every CSS file but I just cant find the section, and searched for "hover" "dropdown" 

All marked with a red arrow.

[SychO]

Those are browser default, you can't customize them. If you want a fancy dropdown you'll need to use javascript as well as css

[lesmond]

Thanks @SychO I had a feeling it may be that, after seeing this code in dev tools with chrome, but not in the actual index.css file

Code Select Expand

::selection {
 text-shadow: none;
 background: #99d4ff;
 color: rgba(0, 0, 0, 0.6);
}
I did notice that the above code has been added to the default themes index.css on GH now here so I manually added that to my theme and changed the colour, it didnt make any difference. 

[SychO]

That changes the style of selected text