How do I use custom classes?

Hi! I´m trying to use custom classes (the last field in muffin builder in most items) to configure individual CSS styles in some cases but I can't get them to work. 

Do I have to declare it as an individual class (example: .icon1 {padding-left: 50px;} ), right? I do so, but changes doesn't take place.

What do I have to do?  

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