Fade out with no edge full screen section

Hi there
im new to webflow!
im trying to recreate some of the effects found on this website http://neueleichtigkeit.ch/
The first hero image is a fixed backgound image that fades out while scrolling down. I managed to reproduce something similar in webflow but i cant get rid of the bottom edge of the picture while fading out…!

Any ideas out there?

Here is my public share link: LINK
(how to access public share link)