I cannot make spaces between rows once I duplicate a row

Hi there!

Thanks for contacting us.

Would you please share ascreencast with us showing your desired function and issue? It will help us to understand it better and advise accordingly.

Best Regards

Kim, If I may....

change Row ID used in 2nd, cloned Row. Row Options > Section ID > change name there or add your own, for example, put "second"

it should help.

If not, instead of margin you can also use padding value.

(!) Remember about Joomla cache or SPPB cache, if you use Production mode.

That's weird. I use this feature every day.

What SPPB version you have?

Can you show us LINK and tell us which rows?

And yes, You can always use custom CSS to put margin for selected Section. Not very elegant, but it works.

#second {margin-top: 50px !important; margin-bottom: 50px !important}

it will work with "second" Section ID name, as I mentioned before

I noticed that You don't know how to use custom CSS inside SP Page Builder :(
You didn't read SPPB documenation about that.
Yes, you made few basic mistakes!

Please use:

#second {margin-top: 50px !important; margin-bottom: 50px !important}
#third {margin-top: 50px !important; margin-bottom: 50px !important}

not inside class name field - but here