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

h1 {
  text-align: center;
  color: #333;
}

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

li {
  background: #fff;
  margin: 10px 0;
  padding: 10px;
  border: 1px solid #ddd;
  border-radius: 5px;
}