How to send data from remotely hosted HTML form to Pi

[sajid]

I'm working on a small project to turn home lights On & Off using Raspberry Pi. I'm able to do so using Python . Now I want to make a web interface to control things. This is the interface I made initially: https://sajidjunoon.github.io/IoT_Project

I wanted to know how will I send data from remotely hosted app/HTML button to my RaspberryPi. What language/library will be used here and how it will be implemented?

I'm sorry if this question is not meant to be posted to this forum.