body {
    font-family: Arial, sans-serif;
    background-color: #f2f2f2;
    margin: 0;
    padding: 0;
  }
  
  header {
    background-color: #27ae60;
    color: white;
    padding: 20px;
    text-align: center;
  }
  
  .container {
    max-width: 800px;
    margin: 20px auto;
    padding: 10px;
  }
  
  .product {
    background-color: white;
    margin-bottom: 20px;
    padding: 15px;
    border-radius: 8px;
    box-shadow: 0 0 10px rgba(0, 0, 0, 0.1);
  }
  
  .product img {
    max-width: 100%;
    height: auto;
    border-radius: 4px;
  }
  
  .product h2 {
    color: #2c3e50;
    margin-top: 10px;
  }
  
  .features {
    margin: 10px 0;
  }
  
  .features li {
    margin-bottom: 5px;
  }
  
  .opinion {
    font-style: italic;
    margin-top: 10px;
    color: #555;
  }
  
  .btn {
    background-color: #27ae60;
    color: white;
    padding: 10px 15px;
    border: none;
    border-radius: 5px;
    text-decoration: none;
    display: inline-block;
    margin-top: 10px;
  }