* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Helvetica, Arial, sans-serif;
  line-height: 1.6;
  color: #24292e;
  max-width: 640px;
  margin: 0 auto;
  padding: 2rem 1.5rem;
}

h1 {
  font-size: 1.8rem;
  margin-bottom: 0.5rem;
}

h2 {
  font-size: 1.25rem;
  margin-top: 1.8rem;
  margin-bottom: 0.4rem;
}

p, ul, ol {
  margin-bottom: 0.8rem;
}

ul, ol {
  padding-left: 1.5rem;
}

li {
  margin-bottom: 0.3rem;
}

a {
  color: #0366d6;
  text-decoration: none;
}

a:hover {
  text-decoration: underline;
}

nav {
  margin-bottom: 2rem;
  padding-bottom: 0.75rem;
  border-bottom: 1px solid #e1e4e8;
  font-size: 0.9rem;
}

nav a {
  margin-right: 1.2rem;
}

.icon {
  display: block;
  margin: 0 auto 1.5rem;
  width: 160px;
  border-radius: 32px;
}

strong {
  font-weight: 600;
}

code {
  font-size: 0.9em;
}