body {
      margin: 0;
      height: 100vh;
      display: flex;
      align-items: center;
      justify-content: center;
      background: #0f172a;
      color: #ffffff;
      font-family: Arial, Helvetica, sans-serif;
      text-align: center;
    }
    .box {
      padding: 40px;
      border: 2px dashed #38bdf8;
      border-radius: 12px;
    }
    h1 {
      margin-bottom: 10px;
    }
    p {
      opacity: 0.8;
    }