<link href="https://fonts.googleapis.com/css2?family=Warnes&display=swap" rel="stylesheet">

<button id="neon" class="noselect">
	<span id="n">N</span>
	<span id="e">e</span>
	<span id="o">o</span>
	<span id="n2">n</span>
</button>

* {
	padding: 0;
	margin: 0;
	box-sizing: border-box;
}

body {
	background-color: #000000;
	background-image: linear-gradient(315deg, #000000 0%, #5e5368 74%);
	height: 100vh;
	overflow: hidden;
	display: flex;
	align-items: center;
	justify-content: center;
}

.noselect {
  -webkit-touch-callout: none;
    -webkit-user-select: none;
     -khtml-user-select: none;
       -moz-user-select: none;
        -ms-user-select: none;
            user-select: none;
}

button {
	background: none;
	border: none;
	font-family: 'Warnes', cursive;
	color: #333;
	font-size: 30px;
	cursor: pointer;
	-webkit-tap-highlight-color: transparent;
	width: 100px;
}

span {
	margin: -6px;
	padding: 0;
	width: 20px;
}

#neon:hover span {
		animation: flicker 1s linear forwards;
}

#neon:hover #e {
	animation-delay: 200ms;
}

#neon:hover #o {
	animation-delay: 500ms;
}

#neon:hover #n2 {
	animation-delay: 600ms;
}

@keyframes flicker {
	0% {color: #333;}
	5%, 15%, 25% {
		color: #fff;
		text-shadow: 0px 0px 25px cyan;
	}
	10%, 20% {
		color: #333;
		text-shadow: none;
	}
	
	30% {
		color: #fff;
		text-shadow: 0px 0px 25px cyan;
	}
	
	100% {
		color: #fff;
		text-shadow: 0px 0px 25px cyan;
	}
}

#neon:focus {
	outline: none;
}