Examine source code of rose gradient

{
  "theme": {
    "images": {
      "theme_frame": "rose1.jpg"
    },
    "colors": {
      "frame": "#f7dc97",
      "tab_background_text": "#030200"
    }
  },
  "version": "2.0",
  "name": "rose gradient",
  "manifest_version": 2,
  "description": "my first try"
}