body {
  font-family: Arial, sans-serif;
  margin: 0;
  padding: 0;
}

header, footer {
  background-color: #f4f4f4;
  text-align: center;
  padding: 15px;
}

nav a {
  margin: 0 10px;
  text-decoration: none;
  color: #333;
}

.product-grid {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
}

.product {
  border: 1px solid #ccc;
  margin: 10px;
  padding: 10px;
  text-align: center;
  width: 300px;
}