Thanks for the suggestion. I've tried various things, and sometimes the current implementation works fine. *I've also encountered the same problem when setting the "safe-area-insets" CSS. I'm not sure which cases this problem occurs in, but it sometimes occurs when trying the following. I'm not sure how to reproduce it yet, but it's not 100% reproducible. However, once it occurs, the same problem persists even when reloading the browser. Switching tab settings in the Settings app while the page is open Opening the same page in a new tab and switching between them Reloading the browser Leaving it for a while and then reloading the browser I suspect that some CSS is being applied in Safari and then cached.