Examine source code of simple dark red

{
  "manifest_version": 2,
  "version": "1.0",
  "name": "simpledarkred",
  "theme": {
    "images": {},
    "properties": {},
    "colors": {
      "toolbar": "rgb(47, 49, 54)",
      "toolbar_text": "rgb(238, 238, 238)",
      "frame": "rgb(0, 0, 0)",
      "tab_background_text": "rgb(187, 187, 187)",
      "toolbar_field": "rgba(154, 31, 65, 0.5)",
      "toolbar_field_text": "rgb(238, 238, 238)",
      "tab_line": "rgba(154, 31, 65, 0.86)",
      "popup": "rgba(154, 31, 65, 0.86)",
      "popup_text": "rgb(238, 238, 238)",
      "button_background_active": "rgb(154, 31, 65)",
      "button_background_hover": "rgba(154, 31, 65, 0.86)",
      "icons_attention": "rgb(154, 31, 65)",
      "ntp_background": "rgb(154, 31, 65)",
      "popup_border": "rgba(154, 31, 65, 0.5)",
      "popup_highlight_text": "rgb(187, 187, 187)",
      "popup_highlight": "rgb(0, 0, 0)",
      "sidebar_border": "rgba(154, 31, 65, 0.5)",
      "sidebar_highlight": "rgb(154, 31, 65)",
      "sidebar_text": "rgb(187, 187, 187)",
      "sidebar": "rgb(57, 60, 67)",
      "tab_loading": "rgb(237, 237, 240)",
      "tab_selected": "rgba(154, 31, 65, 0.86)",
      "toolbar_bottom_separator": "rgba(154, 31, 65, 0.5)",
      "toolbar_field_border_focus": "rgba(154, 31, 65, 0.86)",
      "toolbar_field_border": "rgba(154, 31, 65, 0.5)",
      "toolbar_field_focus": "rgba(154, 31, 65, 0.5)",
      "toolbar_field_highlight_text": "rgb(187, 187, 187)",
      "toolbar_field_highlight": "rgb(0, 0, 0)",
      "toolbar_field_separator": "rgba(154, 31, 65, 0.5)",
      "toolbar_field_text_focus": "rgba(154, 31, 65, 0.86)",
      "toolbar_top_separator": "rgba(154, 31, 65, 0.5)",
      "toolbar_vertical_separator": "rgba(154, 31, 65, 0.5)"
    }
  }
}