Examine source code of Colourful Theme

{
  "name": "Colourful Theme",
  "manifest_version": 2,
  "version": "1.0",
  "theme": {
    "images": {
      "theme_frame": "stock-photo-gradient-background-illustration-abstract-blurred-gradient-background-1371881237.jpg"
    },
    "colors": {
      "frame": "rgba(27, 79, 191, 1)",
      "tab_background_text": "rgba(222, 24, 24, 1)",
      "toolbar": "rgba(32, 22, 224, 1)",
      "bookmark_text": "rgba(171, 31, 222, 1)",
      "toolbar_field": "rgba(237, 19, 201, 1)",
      "toolbar_field_text": "rgba(224, 0, 0, 1)"
    }
  }
}