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With CSS Houdini it's possible.

To draw these irregular lines / shapes with normal CSS it's really hard, maybe if you inline some SVG.

I did implement a version of this in Houdini a couple of years back, that and a short thread of what Houdini was lacking in this case: https://twitter.com/preetster/status/1265679970006757376

Couldn't that be achieved with gradients?