. . background: white border-radius: 50% . , .
, , , ( , , ). img ( , -), radial-gradient , .
. - .
div {
width: 500px;
height: 500px;
background: black;
}
div img {
margin: 100px;
max-width: 50%;
background: radial-gradient(circle at center, white 60%, transparent 61%);
border-radius: 50%;
overflow: hidden;
border: 4px solid green;
}
<div>
<img src="http://i.imgur.com/sDU7Lhz.png">
</div>
Hide result