.shine
{
	background: radial-gradient(
		white 10px, 
		green 15px, 
		transparent 18px
	);
	animation: 1s infinite alternate shining;
}

@keyframes shining 
{
	from
	{ 
		background-position: -5px;
	}
	to
	{ 
		background-position: 8px;
	}
}