body {
  background-color: #000;
}

$portsgreen: #c1d72e;

@include keyframes(blink) {
		  0% {
		    stroke: rgba($portsgreen, 0.8);
		  	stroke-width: 1;
		  } 
		  100% {
		    stroke: rgba($portsgreen, 0.1);
		  	stroke-width: 15;
		  }
		}

circle[fill="#c3d833"] {
  padding: 20px;
  position: relative;
  @include animation(blink 1.5s infinite ease-out);
}