Separate class in html or scss mixin?

Question

css

Tell me which is better,
1 - create a class with properties and hang it on the necessary elements in html
or
2 - create a mixin and connect to the necessary classes, which results in decent code duplication during compilation.
tell me what to read about it.
Or the difference will not be significant and you should not bother

Answer 1

Alex Krynytskyi make a mixin without code duplication.
What exactly is the task?
Which styles will be duplicated?
Throw off an example of the mixin used.