Examine source code of Grey and Blue

{
  "theme": {
    "images": {
      "theme_frame": "./header.jpg"
    },
    "colors": {
      "tab_selected": "#424242",
      "toolbar": "#424242",
      "tab_line": "#00bcd4",
      "frame": "#1f1f1f",
      "tab_background_text": "#ffffff"
    }
  },
  "name": "Grey and Blue",
  "manifest_version": 2,
  "version": "4.0",
  "description": "This theme was created using Ultimate theme creator"
}