.Sidebar {
  float: left;
  background: #eee;
  padding: 20px;
  margin: 0 20px 20px 20px;
  width: 200px;
  cursor: pointer;
}

.Content {
  padding: 20px 20px 20px 300px;
}

.CategoryNav__Toggle:before {
  display: inline-block;
  width: 1em;
  content: '▸';
}

.CategoryNav__Toggle--is-open:before {
  content: '▾';
}