body {
  font-family: Arial, sans-serif;
  margin: 0;
  padding: 0;
  background-color: #f0f0f0;
}

header {
  background-color: #4caf50;
  color: white;
  padding: 1em;
  text-align: center;
}

main {
  margin: 2em;
  text-align: center;
}

.shop-button {
  display: inline-block;
  background-color: #4caf50;
  color: white;
  padding: 10px 20px;
  border-radius: 5px;
  text-decoration: none;
  font-size: 16px;
  transition: background-color 0.3s;
}

.shop-button:hover {
  background-color: #45a049;
}