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

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  line-height: 1.6;
  color: #1a1a1a;
  max-width: 640px;
  margin: 0 auto;
  padding: 2rem 1rem;
}

nav {
  margin-bottom: 2rem;
  padding-bottom: 1rem;
  border-bottom: 1px solid #e5e5e5;
}

nav a {
  margin-right: 1rem;
  color: #0066cc;
  text-decoration: none;
}

nav a:hover {
  text-decoration: underline;
}

h1 {
  margin-bottom: 1rem;
}

p {
  margin-bottom: 1rem;
}