Design is how it works. And your website doesn’t work.
Seriously, there are designers whose entire work output is PDFs or, more recently, stuff in L^HFigma, which lesser beings (read: developers) are expected to turn into functional HTML.
Knowing safari, there's already a bug filed for this behavior which is 6 years old and no one will ever look at or fix since safari on iOS has no competition and thus never has to actually fix bugs (and due to how progressive web apps work, fixing bugs actually takes away from apple's bottom line since safari is competing with the app store, their golden goose).
There's not really any point in supporting a browser engine that's closed source, changes at a whim, can't be compiled on linux to run in CI, and is built by a company that's actively hostile to web standards.
If you want to use the internet with a properly functioning browser and an iPhone, may I suggest moving to the EU where you'll soon be able to run other browser engines
Perhaps spend less time worrying about changing the color of the YouTube logo for no tangible reason.
Edit: Nevermind, seems related to how far you scroll. Scrolling further got me past the first few paragraphs that kept jumping back. Ugh
Maybe take 10% of the time you spent dreaming up new colors to just make your blog function like a regular page instead of adding a million weird animations?