body {
	margin: 0;
	height: 100vh;
	display: flex;
	align-items: center;
	justify-content: center;
	background-color: black;
}

.eyes {
	width: 40em;
	height: 10em;
	font-size: 10px;
	position: relative;
}

.eyes > * {
	box-sizing: border-box;
	position: absolute;
	width: 15em;
	height: 10em;
	border: solid white;
	border-width: 0 5em;
	animation: blink 2s linear infinite;
}

.eyes .left {
	left: 0;
	border-radius: 50% 0;
	transform: rotate(25deg);
}

.eyes .right {
	right: 0;
	border-radius: 0 50%;
	transform: rotate(-25deg);
}

@keyframes blink {
	40%, 60% {
		border-width: 0 5em;
	}

	50% {
		border-width: 0 7.5em;
	}
}