Examine source code of pCloud dark mode

{
  "name": "pCloud dark mode",
  "version": "0.0.1",
  "manifest_version": 2,
  "icons": {
    "16": "icons/icon16.png",
    "48": "icons/icon48.png",
    "128": "icons/icon128.png"
  },
  "content_scripts": [
    {
      "matches": [
        "*://u.pcloud.link/*"
      ],
      "css": [
        "src/pCloud.css"
      ]
    }
  ]
}