HTML Code

<!DOCTYPE html>

<html lang="en">

<head>

  <meta charset="UTF-8">

  <meta name="viewport" content="width=device-width, initial-scale=1.0">

  <title>CSS ease-out Panel</title>

  <style>

    body {

      font-family: system-ui, sans-serif;

      padding: 20px;

      background: #f8fafc;

      color: #334155;

    }



    .wrap {

      display: inline-block;

      padding: 0.75rem 1rem;

      background: #fff;

      border: 1px solid #e2e8f0;

      border-radius: 0.5rem;

      cursor: pointer;

    }



    .panel {

      max-height: 0;

      overflow: hidden;

      opacity: 0;

      transition-property: max-height, opacity;

      transition-duration: 0.45s;

      transition-timing-function: ease-out;

    }



    .wrap:hover .panel {

      max-height: 80px;

      opacity: 1;

      margin-top: 0.5rem;

    }



    .panel p {

      margin: 0;

      font-size: 0.875rem;

      color: #64748b;

    }

  </style>

</head>

<body>

  <h1>ease-out Panel Reveal</h1>

  <div class="wrap">

    <strong>Hover me</strong>

    <div class="panel"><p>Extra details slide in with ease-out — fast start, gentle finish.</p></div>

  </div>

</body>

</html>

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CSS transition-timing-function Property - ease-out UI