body {
      font-family: Arial;
      background: #f0f2f5;
      display: flex;
      justify-content: center;
      align-items: center;
      height: 100vh;
    }

    .box {
      background: white;
      padding: 30px;
      border-radius: 8px;
      box-shadow: 0 4px 8px rgba(0,0,0,0.1);
      width: 100%;
      max-width: 350px;
    }

    input, button {
      width: 100%;
      padding: 10px;
      margin-top: 12px;
      border-radius: 5px;
      border: 1px solid #ccc;
    }

    button {
      background-color: #3498db;
      color: white;
      border: none;
      font-weight: bold;
    }

    .message {
      margin-top: 10px;
      text-align: center;
      color: red;
    }