.two-columns .left-column {
  font-size: 90%;
  height: 100%;
  width: 250px;
  position: fixed;
  background: #fff;
}
.two-columns .left-column .content-treeview a {
  color: black;
}
.two-columns .left-column .content-treeview a img {
  max-height: 16px;
  margin-right: 3px;
  margin-bottom: 4px;
  min-width: 14px;
}