After a long time and virtually no hype, custom CSS is finally on my page! I'm still working on adding a dark mode, but that might take some more time as CSS doesn't have an easy if/else syntax. I'm also not going to go into detail about the CSS, as you would be reading for way longer than 5 minutes. Meanwhile, feel free to enjoy the widescreen page inspired by the IKEA website itself.
Update: The page now has a full dark mode, which is confirmed working in the latest versions of Firefox and Google Chrome.