Box shadow on a round element causes a thin gap [duplicate]

5 days ago 3
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I'm having an issue where when I use border radius in combination of rgba valued colors like let's say rgba(255,255,255,.8) and then use a box-shadow to somewhat make the box appear feathered I get the issue that the corners are not solid as can be seen in this image.

enter image description here

Detail of the top left corner: enter image description here

As can be seen, the edges when using border radius in combination with the other CSS element it makes a weird transparent edge when border-radius is set in place.

I've tried quite a bit but without much success, here's a code attempt as I wanted to attempt this for another project but just simply replicated it here: https://jsfiddle.net/01u7gbxa/1/

The code itself can be applied on any object so it seems which resolves to the same results:

background:rgba(0,0,0,.8); box-shadow:0 0 15px 30px rgba(0,0,0,.8); border-radius:60px;

Does anyone know if this is possible to fix at all?

Thanks in advance for further information.

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