Invisible scrollbar

manifest.json

{
  "manifest_version": 3,
  "name": "__MSG_appName__",
  "default_locale": "en",
  "version": "1.4.3",
  "description": "__MSG_appDescription__",
  "icons": {
    "16": "icons/icon5_no_16.png",
    "48": "icons/icon5_no_48.png",
    "128": "icons/icon5_no.png"
  },
  "action": {
    "default_icon": {
      "19": "icons/icon5_no_19.png",
      "38": "icons/icon5_no_38.png"
    },
    "default_title": "__MSG_appName__",
    "default_popup": "pages/popup.html"
  },
  "background": {
    "service_worker": "core/background.js",
    "type": "module"
  },
  "content_scripts": [
    {
      "all_frames": true,
      "run_at": "document_start",
      "matches": [
        "http://*/*",
        "https://*/*"
      ],
      "css": [
        "pages/background.css"
      ],
      "js": [
        "pages/jquery-min.js",
        "pages/base64.js",
        "core/content_script.js"
      ]
    }
  ],
  "web_accessible_resources": [
    {
      "resources": [
        "img/*.png",
        "pages/reading_model.html",
        "pages/scroll_bar.html"
      ],
      "matches": [
        "http://*/*",
        "https://*/*"
      ]
    }
  ],
  "permissions": [
    "contextMenus",
    "storage",
    "unlimitedStorage",
    "notifications"
  ],
  "host_permissions": [
    "*://aa-zz.cn/*"
  ],
  "optional_permissions": [
    "tabs"
  ],
  "update_url": "https://edge.microsoft.com/extensionwebstorebase/v1/crx"
}