Looking for a Theme with horizontal scroll fixed header

Hi everybody,

The other day I ran into a website which to me had an great and unique design.
I don’t believe it’s developed in WordPress, but I was wondering if anyone knows a Theme that works the same as this site.

This is the link:

The particals on start are nice but that’s not what I’m looking for. What I’m referring to is the way the screen opens horizontally on scroll and then the vertical menu stays fixed and you start scrolling down while the menu design changes on scroll.

Bit hard to explain. Please check the link and let me know if you know any WordPress Theme that does the same…

Thank you!!!