Untitled

<!DOCTYPE html>
<html>
<head>
  <meta charset="utf-8">
  <meta name="viewport" content="width=device-width">
  <title>JS Bin</title>
<style id="jsbin-css">
.animate {
  animation-duration: 2s;
  animation-name: animationTest
}

@keyframes animationTest {
  from {
    opacity: 0;
  }
  to {
    opacity: 1;
  }
}
</style>
</head>
<body>
<div class="animate">
  <h1>This is a test</h1>
</div>


<script id="jsbin-source-css" type="text/css">.animate {
  animation-duration: 2s;
  animation-name: animationTest
}

@keyframes animationTest {
  from {
    opacity: 0;
  }
  to {
    opacity: 1;
  }
}</script>
</body>
</html>