body {
  font-size: 14px;
  font-family: 'Times New Roman', Times, serif;
}
.tree ul {
  list-style-type: none;
  padding-left: 0;
}
.tree ul ul {
  padding: 0.3rem 0 0 1rem;
}
.tree ul li {
  margin-bottom: 0.2rem;
}
.tree .close > ul,
.tree .close > .placeholder {
  display: none;
}
.tree .tree-title {
  cursor: pointer;
  font-size: 1.1rem;
  line-height: 1;
  padding: 0.1rem;
}
.tree .tree-title:hover {
  background-color: #efefef;
}
.tree .folder {
  color: #edbc0b;
  cursor: pointer;
  font-size: 1.1rem;
  float: left;
  margin-right: 0.2rem;
}
.tree .insert_drive_file {
  color: lightgrey;
  font-size: 1.1rem;
  float: left;
  margin-right: 0.2rem;
}
.tree .placeholder {
  font-size: 1.1rem;
  font-style: italic;
  padding-left: 0.5rem;
}