Problem with Media Query working on Iphone 6s

So, the problem is that I try to make my website mobile friendly.
On Laptop it displays really good. I have implemented the Media Query line for a mobile phone.
When I test it in chrome as cross-platform imitating a mobile phone, it works great. Although when I open this website on my phone, It doesn’t display the background image, just white. Tried everything. Any ideas? Or it is not possible?
Btw: Link for website is here:
There you can see the code as well.
Thank you!

How to delete post? I think I found the solution.

well i think its in background image so it not being responsive, m beginner too .