now I like to make the each post card box for the grid post.
I’m not sure I understand your request, do you have an example that we can refer to?
And I would recommend using the Query loop block of GenerateBlocks plugin, as we’ve merged WPSP’s function with GenerateBlocks and stopped supporting WPSP plugin.
With query loop block, you should be able to create your desired layout without using CSS.
Yes, the above code works perfectly on whole blocks. but I exclude the code for top right, which I marked in this screenshot: https://prnt.sc/lHl4v3Ifvjz8