by: Lazur URH
Not the best on the inner corner rounding, but at least it's without gradient repeating. The rendering through browsers makes it worse due to the use of masking.
This is a completely free image Custom Gradient Concept that you can download, post, and use for any purpose.
Image License: CC0 No Rights Reserved
You can copy, modify, distribute and perform the work, even for commercial purposes, all without asking permission, and at no cost. This image is completely free.