HTML Code

<!DOCTYPE html>
<html lang="en">
<head>
  <title>Flexbox Center Example</title>
  <style>
    .center-box {
      display: flex;
      justify-content: center;
      align-items: center;
      height: 160px;
      background: #eff6ff;
      border: 1px solid #93c5fd;
      border-radius: 0.5rem;
    }

    .center-box p {
      margin: 0;
      padding: 0.75rem 1.25rem;
      background: #2563eb;
      color: #fff;
      border-radius: 0.35rem;
      font-family: system-ui, sans-serif;
      font-size: 0.9375rem;
    }
  </style>
</head>
<body style="margin:0;padding:1.5rem;font-family:system-ui,sans-serif;">
  <h1 style="font-size:1.125rem;color:#1e293b;">Centered Content</h1>
  <div class="center-box">
    <p>Perfectly centered</p>
  </div>
</body>
</html>

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CSS Flexbox — Center Content