Examine source code of neue_dark

{
  "manifest_version": 2,
  "name": "neue_dark",
  "version": "2.0",
  "theme": {
    "images": {
      "theme_frame": ""
    },
    "colors": {
      "tab_line": "#282828",
      "tab_selected": "#181818",
      "toolbar": "#181818",
      "icons": "#242424",
      "popup_text": "#aaaaaa",
      "popup_border": "#111111",
      "icons_attention": "#202020",
      "popup": "#111111",
      "popup_highlight_text": "#aaaaaa",
      "tab_loading": "#ff78ff",
      "toolbar_bottom_separator": "#181818",
      "toolbar_field": "#181818",
      "toolbar_field_border": "#181818",
      "toolbar_field_border_focus": "#181818",
      "toolbar_field_focus": "#111111",
      "toolbar_field_text": "#666666",
      "toolbar_field_text_focus": "#aaaaaa",
      "toolbar_field_separator": "#181818",
      "toolbar_top_separator": "#121212",
      "toolbar_vertical_separator": "#131313",
      "tab_text": "#cccccc",
      "button_background_active": "#181818",
      "button_background_hover": "#181818",
      "popup_highlight": "#202020",
      "frame": "#181818",
      "tab_background_text": "#777777",
      "bookmark_text": "#aaaaaa"
    }
  }
}