Examine source code of City lights 2

{
  "name": "swet",
  "manifest_version": 2,
  "version": "1.0",
  "theme": {
    "images": {
      "theme_frame": "swet.jpg"
    },
    "colors": {
      "frame": "rgba(2, 1, 13, 1)",
      "tab_background_text": "rgba(223, 212, 255, 1)",
      "toolbar": "rgba(0, 0, 0, 0)",
      "bookmark_text": "rgba(223, 212, 255, 1)",
      "toolbar_field": "rgba(0, 0, 0, 0)",
      "toolbar_field_text": "rgba(223, 212, 255, 1)"
    }
  }
}