Invisible text – inconsistent theming

[luetage]

I finally got around to reporting some inconsistencies in the UI. While most text and buttons are themed correctly, there are 2 issues I found so far:

• On the vivaldi://experiments/ site, the caution notice has a fixed red color. The color is obviously red as warning, but being able to set the background color freely can result in this:

I didn't pick the exact same color, therefore you can still see the issue, but in the worst case the text would be completely invisible.

• In vivaldi://settings/privacy/ the Delete All Cookies button has a fixed red color too, which results in the same issue – unreadable and in the worst case invisible:

I reported these issues as VB-48636 and VB-48640, but I'm not sure if I caught all red themed items in the UI. Posting this here so we can report more of the same kind. Affected are basically the .danger and .caution classes, no idea if there are more. Would be easiest to just set them to highlight color and that's what I've done for myself in the meantime. It's not only that the items become invisible, but the red looks out of place and clashes with many other background colors too, even if readability is of no concern. I'm aware the color red is used as warning and to draw attention, but I think this could be handled more elegantly.