html {
	min-height: 100vh;
	display: flex;
	flex-direction: column;
}

body {
	margin: auto;
}


.ja {
	animation: cp 250ms infinite step-end;
	font-size: 60px;
}

.ne {
	font-size: 60px;
}

@keyframes cp {
  0% { color: red; }
  50% { color: black; }
  100% { color: red; }
}