body {
  font-family: Arial, sans-serif;
  max-width: 900px;
  margin: auto;
  padding: 20px;
  color: #111;
  background: #fff;
}

header {
  border-bottom: 3px solid #000;
  margin-bottom: 20px;
}

h1, h2 {
  color: #000;
}

ul {
  padding-left: 20px;
}