How to set margin of table in nested grid?

Hello,

May i know how do we set the margin of the table in nested grid? I have an application that contains nested grid (Orientation as Slide) but I noticed the results in nested grid are all sticking together and wonder how do we split them with margin bottom of 20px.

I tried Grid > Setting > Margin to 50 but it only applicable for the grid itself, not the table in nested grid. The only solution I found is to increase the height of the Block in Layout > Block > Block Height as 350 which I don’t think it is a correct solution.

Please advise the solution for this.

Also, how do we include a custom css rule in Scriptcase?

Thank you!