ul, #myUL {
  list-style-type: none;
}
#myUL, ul.nested {
  margin: 0;
  padding: 0;
  border-left: 1px solid #ddd;
}
#myUL li {
  padding: 10px 0;
  padding-left: 20px;
  position: relative;
}
#myUL li:after {
  position: absolute;
    content: "";
    width: 18px;
    height: 1px;
    background-color: #ddd;
    left: 0;
    top:23px;
}
#myUL li + li {
  border-top: 1px solid #ddd;
}
.caret {
  cursor: pointer;
  -webkit-user-select: none; /* Safari 3.1+ */
  -moz-user-select: none; /* Firefox 2+ */
  -ms-user-select: none; /* IE 10+ */
  user-select: none;
}
.caret::before {
  content: "\25B6";
    color: #3b6eb9;
  display: inline-block;
  margin-right: 6px;
}
.caret-down::before {
  -ms-transform: rotate(90deg); /* IE 9 */
  -webkit-transform: rotate(90deg); /* Safari */ '
transform: rotate(90deg);
}
.nested {
  display: none;
}
.active {
  display: block;
}