Examine source code of GD: black theme

{
  "manifest_version": 2,
  "version": "2.0",
  "name": "GD",
  "theme": {
    "colors": {
      "tab_line": "red",
      "ntp_background": "black",
      "toolbar_field": "black",
      "toolbar_field_text": "yellow",
      "toolbar_bottom_separator": "orange",
      "frame": "black",
      "tab_background_text": "white"
    }
  }
}