body {
  max-width: 38rem;
  margin: 4rem auto;
  padding: 0 1.25rem;
  font-family: system-ui, -apple-system, sans-serif;
  font-size: 1.125rem;
  line-height: 1.6;
  color: #222;
}
h1 { font-size: 2rem; line-height: 1.2; }
h2 { font-size: 1.25rem; margin-top: 2.5rem; }
a { color: #0550ae; }
li { margin-bottom: 0.5rem; }
.icon {
  height: 1em;
  width: auto;
  vertical-align: -0.15em;
  margin-right: 0.3em;
}