Dark Mode for Google classroom

manifest.json

{
  "update_url": "https://clients2.google.com/service/update2/crx",
  "name": "Dark Mode for Google classroom",
  "version": "1.0.0.0",
  "description": "This extension changes the theme of google classroom to dark.",
  "manifest_version": 3,
  "action": {
    "default_icon": "icon.png"
  },
  "content_scripts": [
    {
      "matches": [
        "https://*.classroom.google.com/*"
      ],
      "js": [
        "app.js"
      ]
    }
  ]
}