The get request to load font Open Sans from Google’s font api runs into a timeout. My first guess would be that you run the app on premise (judging by the url in the last image), and this environment is not allowed to access the internet. Ask your IT if this is the case, and how to handle this situation based on your company’s policies.
Alternatively, You can try to remove the font import in the main.css file in your project (make a copy of this file before editing it) and then test again on your yenvironment. I added a screenshot of the CSS file where I commented out the font imports.