Border Radius in Maps?

Border Radius in Maps?
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#1

I want to create a border radius like this as per in the image ? How can i do that !


#2

I don’t see anything in the codepen but looks like this property is doing it.

border-radius: 200vh 200vh 0% 0% / 40vh 140vh 0% 0%;


#3

Yes but need to update the border radius like as per in the image