How to overlay an image on a map on a website?

Question

Google

Hi guys. Who can help? I put GoogleMaps on the site, I want to impose such an image of 300x300 with a cat instead of a geolocation marker. It doesn't matter which card to use, the main thing is to put a kote.
Well, it says here:
https://developers.google.com/maps/documentation/j...
that you need to use the Google API, well, I inserted this index.php code at the very beginning and a link to the created map. Well, nothing has changed, who understands?
Stupidly layout will not work ... Here is the site itself: hostels-comfort.ru
And there is another cat down there

Answer 1

I think you need to dig in this direction. Naturally, Kote needs to do less than the crap in the example.