body {
  margin: 40px auto;
  max-width: 650px;
  line-height: 1.6;
  font-size: 18px;
  color: #333;
  background-color: #eee;
  padding: 0 10px
}

h1,
h2,
h3 {
  line-height: 1.2
}

nav a {
  margin-right: .5em
}

img {
  width: 100%;
}

footer {
  text-align: right;
  font-size: 12px;
}