FYI:
It's = "it is" (e.g. "It's a nice day outside."
its = the possessive form of 'it'. (e.g. "It put the thing in its pocket."
There seems to be some grammar confusion in general, but this one happens a bunch. If you're going to do something people must read to enjoy, it's very easy to feed writing into a free grammar too that will tell you how to write stuff. It's just lazy not to do that.