So I have compressed jquery ui stylesheet to save bandwidth and suddenly dialog windows started to look weird.
This is how they look when I use uncompressed stylesheet:
With compressed stylesheet:
I used this website to compress the stylesheet: https://csscompressor.net/
Any ideas what's wrong?
Not all CSS compressors are the same. It's likely the compressor has removed important syntax/grouped styles. This is one of the cons of using a compressor; it can break things. Difficult to tell why exactly without examining the CSS file.
Suggestions: