body {
  color: #111;
  background: #f0f0f0;
  margin: 80px 0;
  font-family: Arial;
  font-size: 20px;
}

main {
  max-width: 800px;
  margin: 0px auto;
}
svg {
  margin: 0px auto;
}

a {
  color: #333;
}

pre {
  background: #ddd;
  padding: 15px;
  word-wrap: normal
}

a:hover {
  background: #aee;
}

@media only screen and (max-device-width: 480px) {

  main {
    margin: 15px;
  }

  body {
    margin: 0;
  }

  svg {
    max-width: 375px;
    margin: 25px -15px;
  }
}