body, h1, p, button, select {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
  }
  
  body {
    font-family: Arial, sans-serif;
    background-color: #f9f9f9;
    color: #333;
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 100vh;
    padding: 20px;
  }
  
  .container {
    background-color: #fff;
    width: 350px;
    border: 1px solid #ddd;
    border-radius: 5px;
    padding: 20px;
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
  }
  
  img {
    width: 100%;
    border-radius: 5px;
    margin-bottom: 15px;
  }
  
  .product-info h1 {
    font-size: 20px;
    margin-bottom: 10px;
  }
  
  .product-info p {
    font-size: 14px;
    color: #666;
    margin-bottom: 10px;
  }
  
  .product-info .price {
    font-size: 18px;
    font-weight: bold;
    margin-bottom: 15px;
  }
  
  .product-info .discounted-price {
    color: #ff0000;
  }
  
  .size-options {
    display: flex;
    gap: 5px;
    margin-bottom: 20px;
  }
  
  .size-options button {
    padding: 8px 12px;
    border: 1px solid #ddd;
    border-radius: 5px;
    background-color: #fff;
    cursor: pointer;
  }
  
  .size-options button:hover {
    border-color: #000;
  }
  
  .size-options button.active {
    background-color: #000;
    color: #fff;
  }
  
  .buy-button {
    display: inline-block;
    width: 100%;
    padding: 10px 0;
    background-color: #333;
    color: #fff;
    text-align: center;
    border: none;
    border-radius: 5px;
    cursor: pointer;
    font-size: 16px;
    text-transform: uppercase;
  }
  
  .buy-button:hover {
    background-color: #000;
  }