#tree {
  grid-area: tree;
  padding: 16px;
  background-color: #333;
  color: #ddd;
  z-index: 100;
}
#tree .node {
  display: grid;
  grid-template-columns: 24px min-content;
  grid-template-rows: min-content 1fr;
  margin-top: 12px;
}
#tree .node .expand-toggle img {
  width: 16px;
  height: 16px;
}
#tree .node .name {
  white-space: nowrap;
  cursor: pointer;
  user-select: none;
}
#tree .node .name:hover {
  color: #fe5f55;
}
#tree .node .name.selected {
  color: #fe5f55;
  font-weight: bold;
}
#tree .node .children {
  padding-left: 24px;
  margin-left: 8px;
  border-left: 1px solid #555;
  grid-column: 1 / -1;
}
#tree .node .children.collapsed {
  display: none;
}