Using Editor Default Resources - Only Dark Theme? (bug?)

Hi,

I want to override the behaviour of a textfield So that its

backgroundImage

is none, unless its pseudo state is hover, or selected.

UXML:

Code (CSharp):

1.             <engine:TextField text="This is a title" class="h1"  name = "Title"/>
2.  

USS:

Code (CSharp):

1. .h1>#unity-text-input
2. {
3.     background-image: none;
4. }
5. .h1>#unity-text-input:hover
6. {
7.     background-image: resource("TextField.png");
8. }
9. .h1>#unity-text-input:focus
10. {
11.     background-image: resource("TextField focused.png");
12. }

This all works fine:




However, as you can see, this is much darker than Unity's Light theme Text Field:


I gathered the resource name, by inspecting the TextField element, and clicking on the

backgroundImage

field:



Why is this happening, shouldn't loading a Unity Default Resource load the resource for the version of unity (pro/non-pro) the user is using?

Any help will be much appreciated!