Your ROOT_URL in app.ini is http://git.osmesh.ru/ but you are visiting http://91.221.70.94:3000/MOS/OpenBoard/src/commit/c28b8c6371b172627ebc1420c0c3c3887d18551a/resources/etc/Tutorial/tutorial_en/CSS
You should set ROOT_URL correctly, otherwise the web may not work correctly.