body {
  font-family: Optima, Candara, Calibri, Arial, sans-serif;
}
code {
  font-family: "Lucida Console", Monaco, monospace;
  font-size: 85%;
}

/* menu */

@media (max-width: 768px) {
  nav#menu {
    display: none;
  }
  /* Style the button when the checkbox is checked */
  #expand-toggle:checked ~ nav#menu {
    display: block;
  }
}