body {
  max-width: 700px;
  margin: 3rem auto;
  padding: 0 1rem;

  font-family: sans-serif;
  line-height: 1.7;
  color: #222;
  background: #fff;
}

a {  color: #06c; }

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

img { max-width: 100%; }

code {
  padding: 0.15rem 0.3rem;
  background: #eee;
}

pre {
  padding: 1rem;
  overflow-x: auto;
  background: #eee;
}