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<!DOCTYPE html>
<html>
<head>
<meta name="viewport" content="width=device-width, initial-scale=1">
<style>
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;
}
.box::before {
  content: "\2610";
  color: black;
  display: inline-block;
  margin-right: 6px;
}
.check-box::before {
  content: "\2611"; 
  color: dodgerblue;
}
.nested {
  display: none;
}
.active {
  display: block;
}
</style>
</head>
<body>
<h2>Tree View</h2>
<p>A tree view represents a hierarchical view of information, where each item can have a number of subitems.</p>