'stackoverflow: save theme preference

Suddenly today stackoverflow looks like this:

screenshot

The blue color is undesired.

I tried to change the theme under settings. The theme is correctly applied, but I don't see a way to save it: As soon as I leave the settings page, the blue colors are back.

What can I do to get to permanently revert to the default look?

UPDATE

Could this be a virus? Heres' what I get on Safari:

enter image description here

I'm on MacOS Monterey. The first screenshot is on Firefox, the second screenshot on Safari. Chrome also gives different colors.



Solution 1:[1]

On the "FILTERS" bar at the bottom of your screen, click on the "circle with slash" icon. It will revert your screen to the default view.

Solution 2:[2]

Check the date. It's April fool's day.

Solution 3:[3]

The way you fix it is you click on your profile picture in the top, then you go to settings, and then you can choose your background. It probably isn't a virus, but I'm not sure.

Sources

This article follows the attribution requirements of Stack Overflow and is licensed under CC BY-SA 3.0.

Source: Stack Overflow

Solution Source
Solution 1 digital_buddha
Solution 2 C.SH.K
Solution 3