How to reuse css class content in another class without copying?

Question

Is it possible to use existing css class as content in another class ?

I mean something like:

Contained in some library:
.class1 { text-indent: 100 }

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Answer 1

Yes, it is possoble.

Write:

.class1,.class2 {text-indent:100;}
.class1{color:red;}
.class2{font-size:30px;}

More info here.