robcoterm/scanlines.css at master · jamesona/robcoterm · GitHub

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.scanlines {
	position: relative;
	overflow: hidden;
}
.scanlines:before, .scanlines:after {
	display: block;
	pointer-events: none;
	content: "";
	position: absolute;
}
.scanlines:before {
	width: 100%;
	height: 2px;
	z-index: 2147483649;
	background: rgba(0, 0, 0, 0.3);
	opacity: 0.75;
	animation: scanline 6s linear infinite;
}
.scanlines:after {
	top: 0;
	right: 0;
	bottom: 0;
	left: 0;
	z-index: 2147483648;
	background: linear-gradient(to bottom, transparent 50%, rgba(0, 0, 0, 0.3) 51%);
	background-size: 100% 4px;
	animation: scanlines 1s steps(60) infinite;
}
/* ANIMATE UNIQUE SCANLINE */
@keyframes scanline {
	0% {
		transform: translate3d(0, 200000%, 0);
	}
}
@keyframes scanlines {
	0% {
		background-position: 0 50%;
	}
}