Hey guys,
I attached a screenshot to make it easier to understand: Basically its quite simple: I want that gradient starting from the middle be a rectangle, not a circle. Reason ist my navbar is completely black and i have an animation at the back going on. I dont like unclean transitions, so I thought i could add a gradient going around the viewport. May someone help me out please?
Thank you so much in advance guys! 
Here is my site Read-Only: LINK
(how to share your site Read-Only link)