Dark - 404 page

The dark 404 page uses the same structure as the article page. 
The second nav section that contains the tabs will not be displayed
The font of the description will be #F1F3F5

<img width="1280" height="1194" alt="Image" src="https://github.com/user-attachments/assets/10c56f6e-fb1c-4aaa-9725-44934a47052d" />