style.css

body {
  margin: 1em 0 5em 0;
  color: #444;
  font-family: Century Gothic, sans-serif;
  font-size: 17px;
}

h2 {
  text-transform: capitalize;
}

.space {
  height: 7em;
}

a.link {
  color: #444;
  text-decoration: none;
  border-bottom: dotted 1px;
}

a.link:hover {
  border-bottom: solid 1px;
}

img {
  padding-bottom: 0.7em;
}

.domains > ul {
  list-style-type: none;
}

.help {
  width: 20px;
  height: 20px;
  background: #A3A3A3;
  border-radius: 50%;
  content: "i";
  font-family: serif;
  text-align: center;
  color: white;
  font-size: 1.0em;
  visibility: hidden;
  display: inline-block;
  vertical-align: top;
}

.domains:hover > .help {
  visibility: visible;
}

.help:hover {
  cursor: pointer;
}

#help-content {
  background: #444;
  color: #ddd;
  font-size: 0.7em;
  width: 20em;
  position: relative;
  padding: 0.7em;
  border-radius: 0.5em;
  display: none;
}

#toc {
  position: fixed;
  left: 1em;
  top: 1em;
  font-size: 0.8em;
  background-color: #E2E2E2;
  padding: 1em;
  border-radius: 0.6em;
  padding-left: 1.5em;
  padding-right: 1.5em;
}

#toc h4 {
  margin: 0 0 0.5em 0;
  text-align: right;
}

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

#toc ul li {
  text-align: right;
}

#toc a {
  color: #444;
  text-decoration: none;
  border-bottom: none;
}

#toc a:hover {
  border-bottom: solid 1px;
}

.section_link {
  visibility: hidden;
}

.container {
  margin-left: auto;
  margin-right: auto;
  width: 640px;
  padding-left: 8em;
}

.row {
  margin: 0;
}

.row:before, .row:after {
  content: "";
  display: table;
}

.row:after {
  clear: both;
}

.col1 {
  width: 100%;
  margin: 0;
  float: left;
}

.col2 {
  width: 50%;
  margin: 0;
  float: left;
}