This challenge was SO hard! I did not get very close to the target. I tried several different strategies based on recent revelations from conversations with other CSS heads. I tried a repeating-radial-gradient but can't change the angle of the curves. I tried absolutely positioning a bunch of arc shapes on an irregular oval. I finally settle on just a radial-gradient where I define all the hard stops. It still misses the mark, but can't say I didn't try!
