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並前往https://stackoverflow.com/questions/50750931/what-do-css-classes-like-my-2-my-lg-0-mr-sm-2-do-in-bootstrap-4

what do css classes like my-2, my-lg-0, mr-sm-2 do in ...

Those are bootstrap spacing utilities classes : mr-sm-2 : r - for classes that set margin-right or padding-right. my-2 , my-lg-0 :.

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