ng-js-tree/demo/bower_components/bootstrap/less/mixins/nav-divider.less

Angular Directive for the famous JsTree

// Horizontal dividers
//
// Dividers (basically an hr) within dropdowns and nav lists

.nav-divider(@color: #e5e5e5) {
  height: 1px;
  margin: ((@line-height-computed / 2) - 1) 0;
  overflow: hidden;
  background-color: @color;
}