:root {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Helvetica, Arial, sans-serif;
  color: #1f2328;
  background: #f6f8fa;
}

body {
  margin: 0;
  line-height: 1.65;
}

main {
  max-width: 820px;
  margin: 60px auto;
  padding: 48px;
  background: white;
  border: 1px solid #d0d7de;
  border-radius: 12px;
}

h1 {
  margin-top: 0;
  line-height: 1.2;
}

h2 {
  margin-top: 32px;
}

nav {
  margin: 24px 0 36px;
  padding-bottom: 20px;
  border-bottom: 1px solid #d8dee4;
}

nav a {
  margin-right: 18px;
}

a {
  color: #0969da;
}

.note {
  padding: 16px 20px;
  background: #f6f8fa;
  border-left: 4px solid #57606a;
}

footer {
  margin-top: 42px;
  padding-top: 20px;
  border-top: 1px solid #d8dee4;
  color: #57606a;
  font-size: 14px;
}

@media (max-width: 700px) {
  main {
    margin: 0;
    padding: 28px;
    border: 0;
    border-radius: 0;
  }
}