CSS breaks when content is loaded via Webview

Hi,

I want to serve some h5p content on my android/ios native mobile app. The problem I have is that h5p content looks "ugly" and some styles are not applied. When I open the page normally inside the web browser, everything looks nice but when I open the same page inside vewbview, the content falls apart and it looks that some CSS files are not loaded. Does someone know where is the issue?

1. Open the h5p content page in webview resulting in CSS issues and page doesn't look as it should
2. Platform and version number. WordPress (latest version).
3. Mobile
4. Browser: Webview
5. H5P plugin version: 1.15.2
6. H5P content type and version: https://h5p.petersons.com/content/?id=155
7. Any browser console errors: None
8. Any PHP errors: None
9. Screenshots if it's a visual problem (attached) 
10. Any recent changes to the environment (new plugins/modules, updates, configuration changes etc.): None
11. Any recent changes to the browser you're using (new extensions, updates etc.): None