body { font: 100%/1.231 arial,helvetica,clean,sans-serif; margin:10px; }
h1 { font-size: 138.5%; }
h2 { font-size: 123.1%; }
h3 { font-size: 108%; }
h1, h2, h3 { margin: 1em 0; }
h1, h2, h3, h4, h5, h6, strong, dt { font-weight: bold; }

h2 {
  background-color: #eee;
  padding: 0.2em;
}
pre code {
  display: block;
  border: 1px solid slategray;
  background-color: whitesmoke;
  padding: 2px;
}
a img {
  border: 0;
}