body {
  font-family: Georgia, serif;
  margin: 0;
  line-height: 1.6;
  color: #222;
}

.site {
  display: grid;
  grid-template-columns: 11em minmax(0, 40em);
  justify-content: center;
  column-gap: 3em;
  padding: 3em 1.5em 4em;
}

.sidebar {
  position: sticky;
  top: 2em;
  align-self: start;
}

.sidebar ul {
  list-style: none;
  margin: 0;
  padding: 0;
}

.sidebar li + li {
  margin-top: 0.35em;
}

.sidebar a {
  color: inherit;
}

.sidebar a[aria-current="page"] {
  font-weight: bold;
}

h1 a {
  color: inherit;
  text-decoration: none;
}

main h2 {
  margin-top: 2.2em;
}

footer {
  margin-top: 3em;
  padding-top: 1em;
  border-top: 1px solid #ccc;
}

@media (max-width: 720px) {
  .site {
    grid-template-columns: 1fr;
    row-gap: 1.25em;
    padding-top: 1.5em;
  }

  .sidebar {
    position: static;
    border-bottom: 1px solid #ccc;
    padding-bottom: 0.75em;
  }

  .sidebar ul {
    display: flex;
    flex-wrap: wrap;
    gap: 0.35em 1.1em;
  }

  .sidebar li + li {
    margin-top: 0;
  }
}