some positions or selected elements don't stand up enough

[Laurencio]

Hello.
I wonder if there may be some improvement in how some elements are "highlighted" or make stand up.
For example, in pop up dialogs windows, where you usually get some buttons like "Save", "Cancell", "Authenticate", "Save As", etc. if you hover them with the mouse, they highlight reasonable well. If Instead, you use the keyboard, there is only a very thin frame that is drawn on the selected element. I think that is too subtle to stand up enough the element for you know where you are. I think this is a little ironic, because when you move he mouse, the pointer tells you where you are, so there is almost no need to highlight things, but when you move with the keyboard, I get lost really very often because I can't tell which element is selected.
Other example is Thunar, You can use the Tab key to move form the side pane to the file list or to the header bar area, being the up arrow (go to parent folder) the default first element selected here. there is again only that thin frame to tell you where you are (in the side pane you don't even get the thin frame).
So I am blindly groping in the dark when I try to move with the keyboard.
I think that's a pity because, for most every other respects, Greybird is one the best themes available for xfce. I still prefer it over others.
I know this is at some extent a design decision with aesthetic concerns, and I respect that, but I think there are functional or ergonomic issues involved here.
To finish, one last example. In libreoffice toolbar, when you press a button, say the bold or italic or underline format button, it gets a little darker. Well that is a little minimalist too, i think. A very little of color would be great to better get aware of which buttons are active at any time.

If anyone suggest me which files I could edit to modify the theme, may be I could dig on it.

Well, that's all for now, I think.
Keep making the best xfce theme.
Thank you
Regards.

using xfce 4.14 on MX Linux 19.2
Greybird 3.22.10

EDIT: Another irony, I find that the qt apps that i have installed like the feather pad text editor or some of the tools of the MX distribution (which I think are also built in qt) do not have this problem, as selected elements are highlighted in blue.

EDIT 2: Well, may be some of the things I have mentioned, how the DE "shows" which element of the window is selected, that is, with the "thin dot frame" are not a property of the theme itself and are a more general gtk environment thing. So may be there isn't much that the theme can do about.

So the question may be: where is that way of "highlighting" elements, the "thin dot frame" and its properties defined? Is it inside or outside the theme? How can we modify it?

[DarkTrick]

A little related: #304