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 translate Center</title>

  <style>

    body {

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

      margin: 0;

      min-height: 100vh;

      background: #0f172a;

      color: #e2e8f0;

    }



    .backdrop {

      position: relative;

      min-height: 100vh;

      display: flex;

      align-items: center;

      justify-content: center;

    }



    .modal {

      position: absolute;

      top: 50%;

      left: 50%;

      translate: -50% -50%;

      width: min(90%, 280px);

      padding: 1.25rem;

      background: #1e293b;

      border: 1px solid #334155;

      border-radius: 0.65rem;

      box-shadow: 0 16px 40px rgba(0, 0, 0, 0.35);

    }



    .modal h2 {

      margin: 0 0 0.5rem;

      font-size: 1.15rem;

    }



    .modal p {

      margin: 0;

      font-size: 0.9rem;

      color: #94a3b8;

    }

  </style>

</head>

<body>

  <div class="backdrop">

    <div class="modal">

      <h2>Centered dialog</h2>

      <p>top/left 50% plus translate -50% centers this box.</p>

    </div>

  </div>

</body>

</html>

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CSS translate Property - Center Overlay