.header {
  text-align: center;
}
body {
  width: min(90%, 980px);
  margin: 0 auto;
  font-family:
    -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Oxygen, Ubuntu,
    Cantarell, "Helvetica Neue", Arial, sans-serif;
  line-height: 1.65;
  color: #222;
  background: #fff;
  padding: 1rem 0 2rem;
}
h1 {
  margin-bottom: 0.25rem;
}
h2 {
  border-bottom: 1px solid #ccc;
  padding-bottom: 0.2rem;
  margin-top: 1.4rem;
  margin-bottom: 0.5rem;
}
p {
  margin: 0.8rem 0;
}
ol,
ul {
  margin: 0.8rem 0 1rem 1.4rem;
}
li {
  margin: 0.35rem 0;
}
blockquote {
  margin: 0.75rem 0 0.75rem 1.2rem;
  padding-left: 1rem;
  border-left: 4px solid #ddd;
  color: #333;
  background: #fafafa;
}
hr {
  border: none;
  border-top: 1px solid #ddd;
  margin: 0.75rem 0 1.2rem;
}