The Facebook icon now is appearing as a black background with a blue "F," rather than the traditional white on blue, for some users.

And the Times said its black logo on a white app background looks good even if your phone is in “dark” mode that changes the screen’s background to permanent black.

"It's a feature on the iOS 18 beta. You can make your background dark plus your icons either light, dark, or tinted (based on the color of your background or whatever color you want)," said one reply.

Since 2013, the iPhone’s Clock icon has featured a distinctive white clock face against a black square background — a familiar and functional design that many have grown attached to.

Musk replaced his own Twitter icon with a white X on a black background and posted a picture on Monday of the design projected on Twitter's San Francisco headquarters.