Examine source code of NordicTheme

{
  "theme": {
    "colors": {
      "tab_selected": "#434c5e",
      "tab_text": "#dbe1ee",
      "toolbar": "#434c5e",
      "tab_line": "#7d9dbc",
      "toolbar_field": "#434c5e",
      "toolbar_field_border": "#434c5e",
      "toolbar_field_border_focus": "#7d9dbc",
      "toolbar_field_text": "#dcdcdc",
      "toolbar_field_text_focus": "#ffffff",
      "frame": "#3B4252",
      "tab_background_text": "#bebebe"
    }
  },
  "name": "NordicTheme",
  "manifest_version": 2,
  "version": "2.0",
  "description": "Theme to match nordic GTk"
}