ul {
    list-style: none;
    padding-left: 1em;
}

.nested-tree {
    display: none;
}
.active {
    display: block;
}
/* Create the caret/arrow with a unicode, and style it */
.caret::before {

    display: inline-block;
    margin-right: 6px;
  }
  

  /* Rotate the caret/arrow icon when clicked on (using JavaScript) */
  .caret-down::before {
    transform: rotate(90deg);
  }