Why did my unactivated windows interface change from a dark color to white when it updated?

I got this laptop two years ago (won it at a raffle seminar lucky me!!). Anyway though, it came with an unactivated version of Windows 10 Home. When it recently did some Windows Updates, it also changed my theme??!  ...Did it have anything to do with me buying a new desktop recently and that one had a light theme instead of a dark one so it just synced it??!

Thanks.

2017-04-11T00:37:33.809Z