Examine source code of Dark and Nice

{
  "manifest_version": 2,
  "version": "1.0",
  "name": "Dark and Nice",
  "theme": {
    "images": {},
    "properties": {},
    "colors": {
      "toolbar": "rgb(20, 20, 20)",
      "toolbar_text": "rgb(255, 255, 255)",
      "frame": "rgb(20, 20, 20)",
      "tab_background_text": "rgb(255, 255, 255)",
      "toolbar_field": "rgb(20, 20, 20)",
      "toolbar_field_text": "rgb(255, 255, 255)",
      "tab_line": "rgb(18, 58, 167)",
      "popup": "rgb(20, 20, 20)",
      "popup_text": "rgb(255, 255, 255)",
      "ntp_background": "rgb(20, 20, 20)",
      "ntp_text": "rgb(255, 255, 255)",
      "popup_border": "rgba(255, 255, 255, 0)",
      "sidebar_border": "rgb(20, 20, 20)",
      "tab_background_separator": "rgba(66, 76, 234, 0)",
      "tab_loading": "rgb(255, 255, 255)",
      "tab_selected": "rgb(66, 76, 234)",
      "tab_text": "rgb(255, 255, 255)",
      "toolbar_bottom_separator": "rgba(255, 255, 255, 0)",
      "toolbar_field_border": "rgba(255, 255, 255, 0)",
      "toolbar_field_separator": "rgba(255, 255, 255, 0)",
      "toolbar_top_separator": "rgba(255, 255, 255, 0)"
    }
  }
}