Examine source code of Yaru Flat

{
  "manifest_version": 2,
  "name": "Yaru Flat",
  "version": "1.0",
  "theme": {
    "colors": {
      "frame": "#242222",
      "tab_background_text": "#9E9E9E",
      "tab_background_separator": "#242222",
      "toolbar": "#2D2B2B",
      "bookmark_text": "#F7F7F7",
      "toolbar_top_separator": "#383636",
      "toolbar_bottom_separator": "#242222",
      "tab_line": "#E95420",
      "tab_loading": "#19B6EE",
      "toolbar_field": "#CACBCC",
      "toolbar_field_text": "#212121",
      "toolbar_field_border": "#242222",
      "toolbar_field_focus": "#F5F6F7",
      "toolbar_field_text_focus": "#212121",
      "toolbar_field_border_focus": "#E95420",
      "toolbar_field_highlight": "#19B6EE",
      "toolbar_field_highlight_text": "#FFFFFF",
      "icons_attention": "#19B6EE",
      "button_background_hover": "#424040",
      "button_background_active": "#19B6EE",
      "popup": "#FFFFFF",
      "popup_text": "#3D3D3D",
      "ntp_background": "#F5F6F7",
      "ntp_text": "#212121"
    }
  }
}