How do they do these really cool background effects?

[jwalter007]

I was wondering how they are achieving these cool background effects, where there might be a wavy color pattern that separates panels
They dont seem to be graphics, as far as I can tell.
I don’t know if can post a link to the site, so I’ll show a clip of the screen.
Thanks

[KetanKumar]

@jwalter007

sorry for any issue but can you try this code

https://codepen.io/tedmcdo/pen/PqxKXg