html {
  font-size: 62.5%;
}

body {
  font-family: Arial, Helvetica, sans-serif;
  font-size: 1.6rem;
  margin: 0;
  background-color: #eee;
}

main {
  display: flex;
  flex-direction: column;
  align-items: center;
}

main h1 {
  font-size: 3.2rem;
  margin: 1rem;
  border-bottom: 1px solid #000;
}

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

main ul li {
  margin: 1rem;
  text-align: center;
}

main ul li a {
  text-decoration: none;
  color: #000;
}

main ul li a:hover {
  text-decoration: underline;
}

main ul li a:active {
  color: red;
}