demo.css

/* Dead basic styles just so the demo page looks okay */
body {
  font-family: 'Roboto', sans-serif;
  line-height: 1.5;
  background-color: #f9f9fa
}

p {
  margin: 0;
  margin-bottom: 20px;
}

#container {
  width: 900px;
  margin: 0 auto;
  font-size: 20px;
  color: #111;
  margin-top: 80px;
}

/* Webkit execCommand applies blockquote styles inline, so we sadly need a higher specificity via !important */
blockquote {
  padding-left: 20px !important;
  border-left: 10px solid #111 !important;
}