pre code {
  border: 1px solid #999;
  display: block;
  padding: 20px;
}
code {
  background-color: #eee;
}
.footer {
    position:fixed;
    right:5;
    top:5;
}
.logo {
  width: 200px;
}
h1 {
  text-align: center;
}
body {
  padding: 30px;
  padding-right: 200px;
  background-color: beige;
}
img {
  display: block;
  margin-left: auto;
  margin-right: auto;
}
blockquote {
  border-left: 3px solid #ccc;
  padding-left: 15px;
}