body {
	background:#000;
}
.container {
	position:relative;
	overflow:hidden;
	width:124px;
	height:124px;
	overflow:hidden;
	margin:100px auto;
	border-radius:50%;
}
.shadow {
	position:absolute;
	top:50%;
	left:50%;
	transform:translate(-50%,-50%);
	width:120px;
	height:120px;
	line-height:120px;
	border-radius:50%;
	color:#fff;
	font-size:20px;
	cursor:pointer;
	box-shadow:60px -60px 0 2px  #e91e63,-60px -60px 0 2px  #e91e63,-60px 60px 0 2px #e91e63,60px 60px 0 2px  #e91e63;
	text-align:center;
}
.shadow:hover {
	animation:border .5s ease forwards;
}
@keyframes border {
	0% {
	box-shadow:60px -60px 0 2px #e91e63,-60px -60px 0 2px #e91e63,-60px 60px 0 2px #e91e63,60px 60px 0 2px #e91e63,0 0 0 2px transparent;
}
25% {
	box-shadow:0 -125px 0 2px #e91e63,-60px -60px 0 2px #e91e63,-60px 60px 0 2px #e91e63,60px 60px 0 2px #e91e63,0 0 0 2px #fff;
}
50% {
	box-shadow:0 -125px 0 2px #e91e63,-125px 0px 0 2px #e91e63,-60px 60px 0 2px #e91e63,60px 60px 0 2px #e91e63,0 0 0 2px #fff;
}
75% {
	box-shadow:0 -125px 0 2px #e91e63,-125px 0px 0 2px #e91e63,0px 125px 0 2px #e91e63,60px 60px 0 2px #e91e63,0 0 0 2px #fff;
}
100% {
	box-shadow:0 -125px 0 2px #e91e63,-125px 0px 0 2px #e91e63,0px 125px 0 2px #e91e63,120px 40px 0 2px #e91e63,0 0 0 2px #fff;
}
}