Authentication dialog title color should be using the same font color and font weight as other dialog titles, see an example in the shutdown dialog. #3B3B3B font color, font weight isn't bold:

Authentication dialog titles look like they do in Adwaita: lighter font color, bold font. This is probably the fallback styling, unless you explictly define how something looks for the Shell, the element always falls back to Adwaita styling.

Open a program that requires authentication (gparted, etc.) or try to install a program from the software center

I am not 100% sure, but in my system the authentication pop up looks Yaru-ish
I think the problem in header's color.
The shutdown dialog, on the contrary, doesn't looks in Yaru style.
In my system, the shutdown dialog is like the one we have in the wiki

however, while taking screenshots something weird happened, the shutdown dialog changed from Yaru to Adwaita style and then 60 seconds after, the notebook shut down, even if I pressed cancel on the dialog, like the original one ( with the Yaru style) disappeared, but continued the count down.
It happened just once though
maybe @didrocks is interested in this last behavior
This is hardly related to the theme. This is the glitch of Shell.
I meant not only the background color, but header and button style.

In GTK's MessageDialog font weight of header is bold and button style different.
This is hardly related to the theme. This is the glitch of Shell.
That's understood, this is why didrock might be interested.
However, if I got it right, the point of this ticket is not the difference
between our gtk and shell theme, which is wanted.
Il sab 27 ott 2018, 18:16 Eaglers notifications@github.com ha scritto:
I meant not only the background color, but header and button style.
[image: 2018-10-27 09-09-21]
https://user-images.githubusercontent.com/40228953/47606462-ed513480-da24-11e8-93f7-6f226f18f3be.pngIn GTK's MessageDialog font weight of header is bold and button style
different.—
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It turns out that the background color is different.
MessageDialog has a dazzling white background (#FFFFFF)
The Shell's dialog has an almost white background (#F4F4F4)
I will create an issue.
Have you manage to reproduce this issue?
Il sab 27 ott 2018, 18:29 Eaglers notifications@github.com ha scritto:
It turns out that the background color is different.
MessageDialog has a dazzling white background (#FFFFFF)
The Shell's dialog has an almost white background (#F4F4F4)—
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What did you do?
It seems hardcoded. I did everything I could think of (to try making the title match the other dialog titles) and still nothing. There's no unused relevant class in polkitAgent.js either.

Ok, the problem was also me reading the bug description on a small screen and missing that the subject was the dialog title. Sorry for the noise
How does it look this way?
(below the auth dialog, there is a screenshot of shutdown dialog for comparison)

That looks good. That's what I was trying to get it to look like. Is that a mockup though, or is that how it looks on your system? (I'm still on 3.28)
It's the real system. I modified the .message-dialog-title class. I am
about to open a PR only with that, and another one for the background color
On Sun, 28 Oct 2018 at 16:03, Aaron Papin notifications@github.com wrote:
That looks good. That's what I was trying to get it to look like. Is that
a mockup though, or is that how it looks on your system? (I'm still on 3.28)—
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