body {
  font-family: Arial, sans-serif;
  background-color: #f4f4f4;
  text-align: center;
  margin: 0;
  padding: 20px;
}

header {
  background-color: #333;
  color: white;
  padding: 10px 0;
}

main {
  margin-top: 20px;
}

ul {
  list-style-type: none;
  padding: 0;
}

li {
  background-color: white;
  margin: 5px;
  padding: 10px;
  border-radius: 5px;
  display: inline-block;
}