CSS code doesn't save

Dzień dobry,
Mam problem z zapisaniem nowego stylu CSS.
W zaawansowanym edytorze dokonuję zmiany stylu wyświetlania, przezroczystości itp.
W innych formularzach to działa, ale tutaj styl się zmienia w edytorze, ale po zapisaniu powraca do poprzednich ustawień. Co robię nie tak? Jak mogę to naprawić?

Hi ONLY_contact,

Thanks for reaching out to Jotform Support. Unfortunately, our Polish Support isn't available right now that is why I'll try to help you in English. I cloned your form and check the Advanced Designer. Because there were two CSS errors you couldn't update the form. In the first error you need to delete the curly braces and in the last one you need to add one curly braces.

Another reason can be related to the code embedded within the wrong HTML element. If you can explain which changes you want to make in your form we can provide you CSS code.

As soon as we hear back from you we'll be able to help you with this.