What is this grey screen spreading onto my iPhone in Safari?

I have an iPhone 6S. Today I noticed something weird when I pull up a new Safari page. Instead of the web address screen that shows icons of my most visited web pages, it is just a white screen (with the URL box). Then, when I type in a website, light grey spreads over the screen. Otherwise safari seems to be working ok, but why is this randomly happening? Could it be a virus?

Take it to an Apple store and let them help you.

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