<div class='target'></div>
$unit: 1em;

.target {
	width: 18*$unit; height: 18*$unit;
	border-radius: 50%;
	box-shadow: 0 0 0 2px #e18728;
	background: repeating-radial-gradient(
		#000 (-$unit), #000 $unit, 
		transparent 0, transparent 3*$unit
	);
}
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