On the iOS 15 update of Safari, there’s a colored top bar in the background at the top of the screen.
You can change what color this is by setting a
theme-color meta property in the
<head> of the HTML page:
<meta name="theme-color" content="#EF4444" />
This will change the color of the section of the interface behind the status bar, above the website itself.
Last updated June 14, 2021