Side Scroll on Web. Fixed Header on Mobile - Ishimoto

Site URL: http://www.courtney-crews.com/

Hi, please help solving two things:

1. I want my images to scroll like these websites:

https://www.arnaldoabba.com/

https://www.lukassuarez.com/LUKAS-1/Archives

http://meaghancurry.squarespace.com/02hi3mtbqahiow24d6za5cgf8z4mab (this one seems buggy when the images load)

2. In Mobile View, I want to freeze the Menu at the top so when scrolling the viewer always has access to the menu.