Examine source code of Dark Theme

{
  "manifest_version": 2,
  "version": "1.1",
  "name": "Dark Theme",
  "theme": {
    "images": {},
    "properties": {},
    "colors": {
      "toolbar": "rgb(30, 30, 30)",
      "toolbar_text": "rgba(255, 255, 255, 0.87)",
      "frame": "rgb(18, 18, 18)",
      "tab_background_text": "rgb(224, 224, 224)",
      "toolbar_field": "rgb(18, 18, 18)",
      "toolbar_field_text": "rgba(255, 255, 255, 0.87)",
      "tab_line": "rgba(248, 112, 140, 0)",
      "popup": "rgb(46, 46, 46)",
      "popup_text": "rgba(255, 255, 255, 0.87)",
      "popup_border": "rgba(34, 34, 34, 0)",
      "sidebar_border": "rgba(126, 145, 126, 0)",
      "sidebar_text": "rgba(255, 255, 255, 0.87)",
      "sidebar": "rgb(30, 30, 30)",
      "toolbar_bottom_separator": "rgb(30, 30, 30)",
      "toolbar_field_border": "rgba(146, 183, 146, 0)",
      "toolbar_field_focus": "rgb(46, 46, 46)",
      "toolbar_field_highlight_text": "rgba(255, 255, 255, 0.87)",
      "toolbar_field_text_focus": "rgba(255, 255, 255, 0.87)",
      "toolbar_top_separator": "rgba(30, 30, 30, 0)",
      "tab_loading": "rgba(248, 112, 140, 0)"
    }
  }
}