Examine source code of London Underground Waterloo & City Line Theme

{
  "manifest_version": 2,
  "version": "1.0",
  "name": "London Underground W&C Line",
  "theme": {
    "images": {},
    "properties": {},
    "colors": {
      "toolbar": "rgb(110, 206, 178)",
      "toolbar_text": "rgb(0, 0, 0)",
      "frame": "rgb(43, 38, 106)",
      "tab_background_text": "rgb(255, 255, 255)",
      "toolbar_field": "rgb(255, 255, 255)",
      "toolbar_field_text": "rgb(0, 0, 0)",
      "tab_line": "rgb(43, 38, 106)",
      "popup": "rgb(43, 38, 106)",
      "popup_text": "rgb(255, 255, 255)",
      "tab_loading": "rgb(43, 38, 106)"
    }
  }
}