ul {
  padding: 3px 0 3px 25px;
}
li {
  padding: 0;
  margin: 0;
  list-style: none;
}
.over-drop-target {
  border: 4px solid #757575;
  transition: padding 0.2s ease-out;
  padding: 5px;
  border-radius: 5%;
}
.tree {
  box-sizing: border-box;
  font-family: "Helvetica Neue", Helvetica, Arial, sans-serif;
}
.tree li {
  list-style: none;
  cursor: default;
}
.tree li div {
  display: inline-block;
  box-sizing: border-box;
}
.tree .node-value {
  display: inline-block;
  color: #212121;
}
.tree .node-value:after {
  display: block;
  padding-top: -3px;
  width: 0;
  height: 2px;
  background-color: #212121;
  content: '';
  transition: width 0.3s;
}
.tree .node-value:hover:after {
  width: 100%;
}
.tree .node-selected:after {
  width: 100%;
}
.tree .folding {
  width: 25px;
  display: inline-block;
  line-height: 1px;
  padding: 0 5px;
  font-weight: bold;
}
.tree .folding.node-collapsed {
  cursor: pointer;
}
.tree .folding.node-collapsed:before {
  content: '\25B6';
  color: #757575;
}
.tree .folding.node-expanded {
  cursor: pointer;
}
.tree .folding.node-expanded:before {
  content: '\25BC';
  color: #757575;
}
.tree .folding.node-leaf {
  color: #212121;
  text-align: center;
  font-size: 0.89em;
}
.tree .folding.node-leaf:before {
  content: '\25CF';
  color: #757575;
}