I'm not talking about a dark theme setting on Chrome that didn't change anything for this issue even if I changed it back and forth, but Chrome suddenly changed its background color from white to black for some web pages which don't set any background color, it seems.
Please take a look at these two pictures. They are the same web pages but the former one is that normally I opened it and the latter one is opened with incognito mode.
Is there any way to fix this problem?
===EDIT===
I relaunched chrome, but didn't work.
Also restarted my PC, but didn't work either.
===EDIT2===
Disabling this setting helped me! Thank you very much everyone and @leeharvey1 !
chrome://flags/#enable-force-dark 5 1 Answer
From the Chrome Experiments page, change the chrome://flags/#enable-force-dark setting from Default to Disabled.