how to do animation css code example

Example 1: css animation

<style>
.my-element {
  width: 100%;
  height: 100%;
  animation: tween-color 5s infinite;
}

@keyframes tween-color {
  0% {
    background-color: red;
  }
  50% {
    background-color: green;
  }
  100% {
    background-color: red;
  }
}

html,
body {
  height: 100%;
}
<style>

<body>
	<div class="my-element"></div>
</body>

Example 2: animations css

window.addEventListener('scroll', () => {
  document.body.style.setProperty('--scroll',window.pageYOffset / (document.body.offsetHeight - window.innerHeight));
}, false);

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Css Example

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