<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <meta http-equiv="X-UA-Compatible" content="ie=edge">
  <title>Glowing Text Animation Effects</title>
  <link href="http://fonts.googleapis.com/css?family=Bad+Script" rel="stylesheet">
</head>
<body>
  <h1>
    <span>S</span>
    <span>t</span>
    <span>u</span>
    <span>n</span>
    <span>n</span>
    <span>i</span>
    <span>n</span>
    <span>g</span>
  </h1>
</body>
</html>
body {
  display: flex;
  justify-content: center;
  align-items: center;
  height: 100vh;
  background-color: #000;
}

h1 span {
  font-size: 10rem;
  font-family: 'Bad Script', cursive;
  color: #111;
  animation: glowing 2s linear infinite;
}

@keyframes glowing {
  0%, 100% {
    color: #fff;
    filter: blur(2px);
    text-shadow: 0 0 10px #00b3ff,
                 0 0 20px #00b3ff,
                 0 0 40px #00b3ff,
                 0 0 80px #00b3ff,
                 0 0 120px #00b3ff,
                 0 0 200px #00b3ff,
                 0 0 300px #00b3ff,
                 0 0 400px #00b3ff;
  } 5%, 95% {
    color: #111;
    text-shadow: none;
    filter: blur(0px);
  }
}

h1 span:nth-child(1){
  animation-delay: 0s;
}

h1 span:nth-child(2){
  animation-delay: .25s;
}

h1 span:nth-child(3){
  animation-delay: .5s;
}

h1 span:nth-child(4){
  animation-delay: .75s;
}

h1 span:nth-child(5){
  animation-delay: 1s;
}

h1 span:nth-child(6){
  animation-delay: 1.25s;
}

h1 span:nth-child(7){
  animation-delay: 1.5s;
}

h1 span:nth-child(8){
  animation-delay: 1.75s;
}

External CSS

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External JavaScript

This Pen doesn't use any external JavaScript resources.