body {
  max-width: 50rem;
  margin: auto;
  font-family: sans-serif;
  font-size: medium;
}

h1, h2, p {
  text-align: center;
}

article h2, article p {
  text-align: left;
}

article h2 {
  padding-left: 1em;
}

a {
  text-decoration: none;
}

menu {
  margin: auto;
  padding: 0;
}

menu li {
  list-style-type: none;
  margin-left: auto;
  margin-right: auto;
  margin-bottom: 0.7rem;
  text-align: center;
}

menu li a {
  border-radius: 0.4rem;
  display: block;
  font-weight: bold;
  padding: 0.5rem;
  margin: auto;
  width: 20rem;

  background-color: lightgrey;
  border-bottom: solid 2px black;
  border-right: solid 2px black;
  color: #202020;
}

menu li a:visited {
  background-color: lightgrey;
  border-bottom: solid 2px black;
  border-right: solid 2px black;
  color: #202020;
}

menu li a:hover {
  background-color: silver;
  border-bottom: solid 2px #222;
  border-right: solid 2px #222;
  color: #303030;
}