body {
  font-family: system-ui, sans-serif;
  margin: 0;
  background-color: #F0F6FA;
}

nav {
  padding: 12px 16px;
  border-bottom: 1px solid #ddd;
}

nav a {
  margin-right: 16px;
  text-decoration: none;
  color: black;
}

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

main {
  max-width: 800px;
  margin: 40px auto;
  padding: 0 16px;
}

h1 {
  text-align: center;
  font-size: 3rem;
  margin-top: 0;
  margin-bottom: 24px;
}