.listree-submenu-heading {
  cursor: pointer;
}
ul.listree {
  list-style: none;
}
ul.listree-submenu-items {
  list-style: none;
  border-right: 1px dashed black;
  white-space: nowrap;
  margin-left: 4px;
  padding-right: 20px;
}
div.listree-submenu-heading.collapsed:before {
  content: "+";
  margin-left: 4px;
}
div.listree-submenu-heading.expanded:before {
  content: "-";
  margin-left: 4px;
}
.scrollable-menu {
  height: auto;
  max-width: 800px;
  overflow-y: hidden;
}