html,
body {
  height: 100%;
  font-family: sans-serif;
}

h1 {
  font-size: 4em;
}

body {
  display: grid;
  place-items: center;
  text-align: center;
}

a {
  background: transparent;
  color: currentColor;
  display: inline-block;
  padding: 0.5em;
  border: 1px solid currentColor;
}