Try it Yourself: Layout

Layout

<!DOCTYPE html>
<html>
<head>
<style>
  .stage {
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 100vh;
    margin: 0;
    background: #f2f4f7;
  }
  .card {
    padding: 24px 32px;
    background: white;
    border-radius: 8px;
    box-shadow: 0 2px 10px rgba(0,0,0,0.12);
    font-family: sans-serif;
  }
</style>
</head>
<body>
  <div class='stage'>
    <div class='card'>
      <h2>Perfectly centered</h2>
      <p>This card sits dead-center no matter the viewport size.</p>
    </div>
  </div>
</body>
</html>

<!DOCTYPE html>
<html>
<head>
<style>
  .stage {
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 100vh;
    margin: 0;
    background: #f2f4f7;
  }
  .card {
    padding: 24px 32px;
    background: white;
    border-radius: 8px;
    box-shadow: 0 2px 10px rgba(0,0,0,0.12);
    font-family: sans-serif;
  }
</style>
</head>
<body>
  <div class='stage'>
    <div class='card'>
      <h2>Perfectly centered</h2>
      <p>This card sits dead-center no matter the viewport size.</p>
    </div>
  </div>
</body>
</html>