body {
  color: #222;
  background-color: #f1f1f1;
  font-size: 16px;
  line-height: 24px;
  font-family: "Roboto", sans-serif;
  margin: 0;
}

#main {
  display: flex;
  justify-content: center;
  align-items: center;
  height: 50vh;
}

h1 {
  font-weight: normal;
  font-size: 1.2em;
}

pre {
  margin: 2em;
}