Dark theme for JSONVue

1. Install extention from Chrome Webstore: https://chromewebstore.google.com/detail/jsonvue/chklaanhfefbnpoihckbnefhakgolnmc
2. Open settings page: chrome-extension://chklaanhfefbnpoihckbnefhakgolnmc/css-editor.html
3. Paste css from this gist to editor and press Save button