Examine source code of Dark

{
  "manifest_version": 2,
  "version": "1.0",
  "name": "Dark",
  "theme": {
    "images": {},
    "properties": {},
    "colors": {
      "toolbar": "rgb(20, 20, 25)",
      "toolbar_text": "rgb(240, 240, 240)",
      "frame": "rgb(20, 20, 25)",
      "tab_background_text": "rgb(240, 240, 240)",
      "toolbar_field": "rgb(32, 32, 35)",
      "toolbar_field_text": "rgb(240, 240, 240)",
      "tab_line": "rgba(255, 255, 255, 0)",
      "popup": "rgb(20, 20, 25)",
      "popup_text": "rgb(205, 205, 205)",
      "tab_background_separator": "rgba(0, 0, 0, 0.4)",
      "tab_selected": "rgb(32, 32, 35)",
      "toolbar_field_border": "rgb(39, 39, 39)",
      "toolbar_field_focus": "rgb(32, 32, 35)",
      "toolbar_field_separator": "rgb(42, 42, 46)",
      "toolbar_top_separator": "rgb(27, 27, 30)",
      "toolbar_vertical_separator": "rgb(42, 42, 46)",
      "tab_loading": "rgba(255, 255, 255, 0)"
    }
  }
}