html {
  height: 100%;
}

body {
  background-color: #efefef;
  display: flex;
  height: 100%;
  font-family: sans-serif;
}

.main {
  text-align: center;
  margin: auto;
  max-width: 800px;
  padding: 1em;
}

.intro {
  color: #555;
  font-size: 2em;
}

.contact {
  color: #888;
  font-size: 1.5em;
}