body {
  font-family: Arial, sans-serif;
  max-width: 900px;
  margin: 40px auto;
  padding: 20px;
  line-height: 1.6;
  background: #ffffff;
  color: #222;
}

h1 {
  border-bottom: 2px solid #000;
  padding-bottom: 10px;
}

h2 {
  margin-top: 30px;
}

ul {
  margin-left: 20px;
}