body {
      background: #f0f2f5;
      font-family: 'Arial', sans-serif;
    }
    .registration-form {
      background: #fff;
      padding: 30px;
      border-radius: 15px;
      box-shadow: 0 8px 20px rgba(0,0,0,0.1);
      max-width: 500px;
      margin: 50px auto;
    }
    .registration-form h2 {
      text-align: center;
      margin-bottom: 25px;
      font-weight: bold;
      color: #333;
    }
    .form-control:focus {
      box-shadow: none;
      border-color: #10b981;
    }
    .btn-primary {
      background-color: #10b981;
      border: none;
    }
    .btn-primary:hover {
      background-color: #10b981;
    }
    @media (max-width: 768px) {
      .registration-form {
        margin: 20px;
        padding: 20px;
      }
    }