Problem : map php not open but downloaded

[CorentinLemaitre]

hello everybody !
I have try to use your code to track me in a webpage. I think i understand the way it works but when i open the index page and when i click in map it download the file and not open a map.
Here is the webpage : https://corentinlemaitre.github.io/track/
An here is the code : https://github.com/CorentinLemaitre/CorentinLemaitre.github.io/tree/master/track

Hope there is people following this...