I was looking around to get a feel for the changes when I noticed that the colour scheme is different on some pages, I'm not sure why? Red and black (darkmode)

I was looking around to get a feel for the changes when I noticed that the colour scheme is different on some pages, I'm not sure why? Red and black (darkmode) https://developer.mozilla.org/en-US/docs/Web/HTML/Element/body https://developer.mozilla.org/en-US/docs/Web/HTML/Element/bo... Blue and black (darkmode) https://developer.mozilla.org/en-US/docs/Web/Guide/HTML/Content_categories https://developer.mozilla.org/en-US/docs/Web/Guide/HTML/Cont... Both pages are under the "References" section.