ul, #myUL {
  list-style-type: none;
}

#myUL {
  margin: 0;
  padding: 0;
}

.box {
  cursor: pointer;
  -webkit-user-select: none; /* Safari 3.1+ */
  -moz-user-select: none; /* Firefox 2+ */
  -ms-user-select: none; /* IE 10+ */
  user-select: none;
  font-size: 14px;
}

.box::before {
  content: "\2610";
  color: black;
  display: inline-block;
  margin-right: 6px;
  font-size: 14px;
}

.check-box::before {
  content: "\2611"; 
  color: dodgerblue;
}

.nested {
  display: none;
  font-size: 14px;
}

.active {
  display: block;
}