HTML Code

<!DOCTYPE html>
<html>
<head>
  <title>CSS animation-duration Example</title>
  <style>
    @keyframes colorChange {
      from { background-color: red; }
      to { background-color: yellow; }
    }

    .animated-box {
      width: 100px;
      height: 100px;
      animation-name: colorChange;
      animation-duration: 3s;
      animation-timing-function: ease-in-out;
      animation-iteration-count: infinite;
      animation-direction: alternate;
    }
  </style>
</head>
<body>
  <h1>Animated Box with Duration</h1>

  <div class="animated-box"></div>
</body>
</html>

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CSS animation-duration Property - Color Change