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How to change outer color?

gb flag

I am in Xubuntu. I had downloaded Okular after reading it. I can change inner color. But what about outer color?

picture

I can rest my eye by inner color. But I am unable to change outer color. Is there possible way to change outer color either?

I am changing color from here. But, I can't see how I can change those grey (not grey they white) interfaces color.

Gounou avatar
us flag
What do you mean by "outer color"? The grey line or all the interface?
us flag
Do you want to achieve something like this? https://askubuntu.com/questions/1354831/how-can-i-change-okulars-gui-so-i-get-white-text-on-black-background-or-similar/1356691#1356691
Unknown avatar
gb flag
@Gounou Yes! Those gray interfaces..
Unknown avatar
gb flag
@ArchismanPanigrahi nope! That's not helpful. I was only talking about Okular rather than other applications.
us flag
@IstiakShovon I guess all Qt applications are affected (Okular is one of them), but GTK applications don't have this issue. Could you try the solution in that question? You need to change the Qt theme (with KVantum, or with qt5ct), as described in their answer. qt5ct will copy your current theme, i.e. if the other applications have a grey theme, Okular will also obtain the same.
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