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One solution to do this would be using Clip-path
as in this example, has up to the one website that will automatically generate mind but does not have support for all browsers
But the best solution is Joseph Fusco that puts a svg to the edge he wants drawn. This one has support for all browsers
in the example you put it can do as follows
- create a svg with white cut design
- would place this svg in Base64 with
after
If you find it too difficult, take the factored image in png with this transparent cut