Examine source code of Fade Black - Black

{
  "theme": {
    "images": {
      "theme_frame": "HeaderImage.png"
    },
    "colors": {
      "frame": "#141313",
      "tab_background_text": "#000000"
    }
  },
  "version": "2.0",
  "name": "Fade Black - Black",
  "manifest_version": 2,
  "description": "Fade black on the bottom then it get blacker and blacker till to the top"
}