body {
  background-color: #e0e0eb;
}

div.header {
  margin-left: auto;
  margin-right: auto;
  max-width: 60em;
  padding-left: 2em;
  padding-right: 2em;
}

div.contents {
  margin-left: auto;
  margin-right: auto;
  max-width: 60em;
  background-color: white;
  padding: 2em;
  border-radius: 1em;
}