Mobile version not responsive after custom modifications to style.css

Hi,

I have issues with mobile mode. It is not responsive. It seems like the pictures are pushing the site to the right and leave a blue color on the side. It is only on mobile and not in regular mode. I have tried to turn off all plugins but the problem persists
the url is:

https://xn—–vldc4bacb0aid0avn0fj5ac.co.il/

Attached are screenshots:

Also in the mobile header, is there a way to change the order of the items in the header only for the mobile version and also an option to have a drop down instead of a full list that takes up all the screen?

Thank you.