When I am at website https://poczta.o2.pl works fine, but when I am logging to my mail, website is not loading, only few rows of text is displayed.
I tried cleaning cache, cookies, history - nothing works. In attachments I am sending how it looks. On logging page all is ok (second picture).
This happens when CSS files are blocked. I see this style sheet:
You can check the Web Console (Tools -> Web Developer) for messages about blocked content and about the presence of mixed or unsafe content.
You can check the Network Monitor to see if content is blocked or otherwise fails to load.
If necessary use "Ctrl+F5" or "Ctrl+Shift+R" (Mac: Command+Shift+R) to reload the page and bypass the cache to generate a fresh log.