Can't write any css rules anymore...

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Hi, I can't understand what happened today, I can't use my classes and id; and the css in browsers is weird. I use Chrome for editing, but the same is in Safary too. I know css well and until today writing the rules was easy. Only thing I did today was that I tried the Maintenance mode, but came back to normal and cleared cache too (cache is not even on).

It's okey now: there was one missing sign in css-file between the rules; so targeting didn't work. I lost 5 hours because of this...

Junius