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HTML

CSS

* {
      box-sizing: border-box;
      margin: 0;
      padding: 0;
    }
    body {
      height: 100vh;
      display: flex;
      align-items: center;
      justify-content: center;
      background: linear-gradient(135deg, #0f172a, #1e293b);
      color: #f8fafc;
      font-family: 'Poppins', sans-serif;
      text-align: center;
    }
    .container {
      max-width: 300px;
      padding: 30px;
      border-radius: 20px;
      background: rgba(255, 255, 255, 0.05);
      backdrop-filter: blur(10px);
      box-shadow: 0 0 30px rgba(0, 0, 0, 0.2);
      animation: fadeIn 1s ease-in-out;
    }
    h1 {
      font-size: 2.5rem;
      color: #38bdf8;
      margin-bottom: 10px;
      letter-spacing: 1px;
    }
    p {
      font-size: 1rem;
      color: #cbd5e1;
      margin-bottom: 30px;
      line-height: 1.5;
    }
    .btn {
      display: inline-block;
      background: linear-gradient(90deg, #38bdf8, #2563eb);
      color: white;
      padding: 12px 28px;
      border-radius: 30px;
      font-weight: 600;
      font-size: 1rem;
      text-decoration: none;
      transition: all 0.3s ease;
      box-shadow: 0 0 15px rgba(56, 189, 248, 0.3);
      cursor: pointer;
    }
    .btn:hover {
      transform: scale(1.05);
      box-shadow: 0 0 20px rgba(56, 189, 248, 0.6);
    }
    @keyframes fadeIn {
      from { opacity: 0; transform: translateY(20px); }
      to { opacity: 1; transform: translateY(0); }
    }