body {
  font-family: Arial, sans-serif;
  margin: 40px;
  background: #f6f8fa;
  color: #333;
}
header {
  text-align: center;
  margin-bottom: 40px;
}
h1 {
  margin-bottom: 5px;
}
section {
  background: #fff;
  padding: 20px;
  border-radius: 8px;
  margin-bottom: 20px;
  box-shadow: 0 2px 4px rgba(0,0,0,0.1);
}
ul li {
  padding: 5px 0;
}