Forum Dark theme
Because of that effect with the background and whatever blur overlay thing is going on, some browsers render it different color in the main container #202020 color on the content is rendered #1c2327, and around it creates that bleed of jagged green ... is a different color, from different family. Now all the notifications are red while previously only flags or notifications related to moderation were red, the other were green. That "white" footer makes things even worse visually, it should remain dark, not have the foreground graphical elements white.
The light theme does not suffer from this sort of shift in colors nor the jagged bleed. Don't know what that circle and tilted square in the background are suppose to add visually to the table, but seem like a random choice, aleatory ... Still, the notifications should not be all red.
Other browsers are not capable to render properly the footer banner, so it looks broken ... the jaggedness is still present, but the color shift of #202020 color on the content to #1c2327 does not happen only in the sidebar bottom portion of the forum, while the container keeps the original color in comparison to what happens in my first screenshot ...
Last visit badge on the new posts looks like this
While last visit on topics comments look like this
That is another color shift.
The quote selection buttons remain dark on dark on mouse over.