/* (A) LIST TO MENU */
.tree, .section ul {
  list-style: none;
  padding: 0;
  margin: 0;
}
.tree {
/*  background: #fbfbfb;
  border: 1px solid #d2d2d2;*/
  border-radius: 5px;
}
.tree li {
  border-bottom: 1px solid #d2d2d2;
  padding:5px;
}
.tree li:last-child {
  border: 0;
}

/* (B) SUB-SECTIONS */
/* (B1) TOGGLE SHOW/HIDE */
.section ul, .section ul ul { display: none; }
.section input:checked ~ ul,.section ul input:checked ~ ul { display: block; }

/* (B2) HIDE CHECKBOX */
.section input[type=checkbox] { display: none; }

/* (B3) ADD EXPAND/COLLAPSE ICON  */
.section { 
  position: relative; 
  padding-left: 25px !important;
}
.section ul {
    /*padding: 0 0 0 10px;*/
}
.section label {
    margin: 0;
    font-size: 15px;
    color: #007bff;
}

.section label.tree_label {
    position: absolute;
    left: 4px;
/*    background: #3866c8;
    padding: 0;
    display: block;
    padding: 1px 5px;
    color: #fff;*/
}
.tree_icon {
    font-size: 15px;
    line-height: 15px;
}
.section .tree_link.active {
    font-weight: bold;
}
/*.section label:after {
  content: "\0002B";
  position: absolute;
  top: -5px; left: 0;
  padding: 0px 10px;
  text-align: center;
  font-size: 30px;
  color: #007bff;
  transition: all 0.5s;
}
.section input:checked ~ label .tree_icon { 
  color: #23c37a;
  transform: rotate(45deg);
}
*/

/* (B4) SUB-SECTION ITEMS */
.section ul li.active { color: #007bff; }

/* DOES NOT MATTER */
.tree {
   font-size: 15px;
}