Background Color Changer

Change the color of any webpage. Color Appears Where there are no elements
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manifest.json
{
  "update_url": "https://clients2.google.com/service/update2/crx",
  "name": "Background Color Changer",
  "version": "1.0",
  "description": "Change the color of any webpage. Color Appears Where there are no elements",
  "permissions": [
    "activeTab",
    "declarativeContent",
    "storage"
  ],
  "options_page": "option.html",
  "background": {
    "scripts": [
      "background.js"
    ],
    "persistent": false
  },
  "page_action": {
    "default_popup": "popup.html",
    "default_icon": {
      "16": "images/favicon-16x16.png",
      "32": "images/favicon-32x32.png",
      "48": "images/really.ico",
      "128": "images/more.ico"
    }
  },
  "icons": {
    "16": "images/favicon-16x16.png",
    "32": "images/favicon-32x32.png",
    "48": "images/really.ico",
    "128": "images/more.ico"
  },
  "manifest_version": 2
}