Examine source code of kebdark_flat

{
  "manifest_version": 2,
  "version": "1.0.0",
  "name": "kebdark_flat",
  "theme": {
    "colors": {
      "frame": "#191919",
      "tab_background_text": "#8e96a5",
      "toolbar": "#191919",
      "bookmark_text": "#D4D7DD",
      "tab_text": "#D4D7DD",
      "tab_line": "#191919",
      "tab_background_separator": "#191919",
      "toolbar_text": "#9DA5B4",
      "toolbar_field": "#191919",
      "toolbar_field_border": "#191919",
      "toolbar_field_border_focus": "#40417c",
      "toolbar_field_highlight": "#40417c",
      "toolbar_field_text": "#9DA5B4",
      "toolbar_field_separator": "#313131",
      "toolbar_top_separator": "#191919",
      "toolbar_bottom_separator": "#191919",
      "ntp_background": "#191919",
      "ntp_text": "#D4D7DD",
      "popup": "#191919",
      "popup_text": "#9DA5B4",
      "popup_highlight": "#21252B",
      "popup_highlight_text": "#D4D7DD",
      "sidebar": "#191919",
      "sidebar_text": "#D4D7DD",
      "sidebar_highlight": "#353535",
      "sidebar_highlight_text": "#D4D7DD",
      "button_background_active": "#454545",
      "button_background_hover": "#353535"
    }
  }
}