Examine source code of Windows 10 Gradient Blue

{
  "theme": {
    "images": {
      "theme_frame": "header.png"
    },
    "colors": {
      "frame": "#000000",
      "tab_background_text": "#e3e3e3"
    }
  },
  "version": "2.0",
  "name": "Windows 10 Gradient Blue",
  "manifest_version": 2,
  "description": "Just another Windows 10 inspired blue theme with a mild darker blue gradient. Enjoy"
}