body {
  margin: 0;
  background: #f5f7fa;
  color: #16202e;
  font: 16px/1.5 system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
}
main {
  max-width: 720px;
  margin: 0 auto;
  padding: 32px 16px 48px;
}
h1 { font-size: 28px; line-height: 1.2; margin: 0 0 8px; }
h2 { font-size: 20px; margin: 32px 0 8px; }
h3 { font-size: 17px; margin: 20px 0 4px; }
.lead, .links { color: #5a6474; }
ul { padding-left: 20px; margin: 4px 0; }
li { margin: 4px 0; }
a { color: #1565c0; }
.links { margin-top: 40px; }