ul.tree {
  display: block;
  margin-left: 10px;
  padding-left: 0;
}

ul.tree ul {
  display: block;
  margin-left: 0;
  padding-left: 0;
  margin-top: 0;
  margin-bottom: 0;
}

ul.tree li {
  display: block;
  list-style-type: none;
  padding-left: 20px;
  background-image: url("document.gif");
  background-position: left top;
  background-repeat: no-repeat;
  margin-bottom: 16px;

}

ul.tree li a {
	text-decoration: none;
	cursor: pointer;
	font-size: 15px;
	color: black;
}

ul.tree li a:hover {
	text-decoration: underline;
	color: red;
}