How to create negative border-radius with no gradient?

How to create a border without a negative background-image with gradient ?
I need boreder
5e10963444308094887530.png
Found the Internet only such solutions
Here
April 4th 20 at 00:45
1 answer
April 4th 20 at 00:47
Solution
Look here I made a blank example, for the gradient just play with filters and overlappings and succeed!

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