How do I achieve curved horizon line like effect?

Hello, I don’t know if it’s right place to post it but it does have to do something with graphics so I’m posting it here

So, for my game I want it to have like the effect of screen curving away near the edges like here (green line):

But I don’t know how to do this and I have searched most of the internet and I haven’t found anything that would help me with this.
If you know how to solve this problem feel free to reply! Thanks

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You mean something like this?

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yes, that’s exactly what I meant by that