body {
  font-family: Arial, sans-serif;
  text-align: center;
  padding: 30px;
  background: #fefefe;
}
h1 {
  color: #333;
}
ul {
  list-style: none;
  padding: 0;
}
li {
  margin: 10px 0;
  font-size: 18px;
}
button {
  padding: 10px 20px;
  font-size: 16px;
  background: #28a745;
  color: white;
  border: none;
  border-radius: 5px;
}