html {
  background: #f9f9f9;
  font-size: 115%;
}
body {
  background: #fcfcfc;
  margin: auto;
  max-width: 90ex;
  padding: 1ex;
  border-radius: 1ex;
}
[role="banner"] > img {
  float: right;
  max-width: 150px;
}