Examine source code of google-doodle-logo

{
  "name": "google-doodle-logo",
  "manifest_version": 2,
  "version": "1.0",
  "theme": {
    "images": {
      "theme_frame": "google-doodle-logo.jpg"
    },
    "colors": {
      "frame": "rgba(18, 85, 230, 1)",
      "tab_background_text": "rgba(0, 0, 0, 1)",
      "toolbar": "rgba(204, 34, 34, 1)",
      "bookmark_text": "rgba(143, 60, 60, 1)",
      "toolbar_field": "rgba(227, 20, 20, 1)",
      "toolbar_field_text": "rgba(31, 27, 27, 1)"
    }
  }
}