p.source {
  color: grey;
  font-size: 8px;
  text-align: center;
}

img.center {
  display: block;
  margin-left: auto;
  margin-right: auto;
}

img.left {
  margin-left: 8px;
}

code.code {
  color: grey;
  font-size: 11px;
}