Responsive landing page using CSS grid

Hello everyone,

This is my first project on my own after taking a course in Udemy and many hours of youtube tutorials. I think I did alright with the exception of the mobile aspect I could not get it to work and got a bit frustrated. Looking forward to any constructive feedback so I can get better. Thanks

The media queries would not work for some reason. I looked up some videos on youtube in order to see if I was doing anything wrong but I don't know it just wouldn't work.