text: import red from '@material-ui/core/colors/red';
  import blue from '@material-ui/core/colors/blue';
  import green from '@material-ui/core/colors/green';
  import grey from '@material-ui/core/colors/grey';
  
  
  // https://tachyons.io/docs/themes/skins/
  export const DEFAULT_NODE_COLOR = blue[100];
  // export const DEFAULT_NODE_COLOR = '#96CCFF'; // light-blue
  export const ROOT_NODE_COLOR = grey[600];
  export const SELECTED_NODE_COLOR = red[100];
  // export const SELECTED_NODE_OUTLINE = red[500];
  export const SELECTED_NODE_OUTLINE = '#E7040F'; // dark red tachyons
  
  export const LEAF_NODE_COLOR = green[100];
  // export const LEAF_NODE_COLOR = '#9EEBCF';
  // export const ISLAND_NODE_COLOR = grey[200];
  export const ISLAND_NODE_COLOR = "#cccccc";
  