html - Transparent border radius outside -


i need help, have div border-radius , need transparent outside circle div. tried :after , outline. ":after" border stayed within div , outline couldn't rounded.

does know answer ?

css :

    div.circle {         background: black;         width: 5em;         height: 5em;         -moz-border-radius: 2.5em;         -webkit-border-radius: 2.5em;         border-radius: 2.5em;     }    div.circle p {         padding: 2em 2em 0 2em;         color: white;     }     div.circle:after {         content:'';         display: block;         position: absolute;         top: 0;         bottom: 0;         left: 0;         right: 0;         border-radius: 2.5em;         border: 4px solid rgba(255, 255, 255, 0.51);     }

css outline property: 

   div.circle {      outline: 4px solid rgba(255,255,255,0.3);       background: black;      width: 5em; height: 5em;      -moz-border-radius: 2.5em;      -webkit-border-radius: 2.5em;      border-radius: 2.5em; }

what want: http://giovannigras.be/home/img.png

use box-shadow instead of border:

box-shadow: 0 0 0 4px rgba(255, 255, 255, 0.51);

cause transparent border transpare background beneath,
while if use spread value in box-shadow property you're go:

example demo

also suggested @vals can go background-clip retain background size content-box size model cause otherwise goes default border-box.

docs:
https://developer.mozilla.org/en-us/docs/web/css/box-shadow
https://developer.mozilla.org/en-us/docs/web/css/background-clip


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