body {
  font-family: Arial, sans-serif;
  margin: 0;
  padding: 0;
  line-height: 1.5;
  color: #111;
  background: #fff;
}

header, main {
  max-width: 800px;
  margin: 0 auto;
  padding: 24px;
}

h1, h2, h3 {
  margin-bottom: 8px;
}

section {
  margin-top: 40px;
}

article {
  margin-bottom: 24px;
  padding-bottom: 16px;
  border-bottom: 1px solid #ddd;
}