* {
  box-sizing: border-box;
}

html,
body {
  margin: 0;
  padding: 0;
  height: 100%;
}

html {
  font-size: 18px;
  font-weight: 400;
  font-family: -apple-system, BlinkMacSystemFont, Helvetica, Arial, sans-serif;
}

.simple-column {
  margin: auto;
  max-width: 690px;
  padding-top: 1rem;
  position: relative;
}

.row {
  padding: 1rem;
}

.mb-1 {
  margin-bottom: 1rem;
}

.mb-2 {
  margin-bottom: 2rem;
}

.header {
  display: flex;
  align-items: center;
}

.pull-right {
  margin-left: auto;
}

#toc {
  position: absolute;
  left: -200px;
  width: 200px;
  top: 200px;
}

#toc ul {
  padding-left: 0;
  list-style: none;
  margin-top: 0;
  margin-bottom: 0;
}

#toc > ul > li {
  margin-top: 1.5rem;
}

#toc > ul > li > a {
  font-weight: 700;
  color: black;
}

#toc > ul > li > ul a {
  font-weight: 400;
  font-size: 0.85rem;
  color: black;
}

.back-to-top {
  font-size: 0.85rem;
  float: right;
  margin-top: 0.5rem;
  font-weight: 400;
}

footer {
  margin-top: 2rem;
  text-align: center;
  font-size: 0.9rem;
}

footer ul {
  margin: 0;
  padding: 0;
}

footer ul li {
  display: inline-block;
  padding: 1rem;
}

footer ul li a {
  color: #666;
}