Reply To: How to create a section like in your demo video

[Leo]

You should be able to enter the code in both editors.
Try the the code in this link to make a 3 columns by 2 rows block:
https://gist.github.com/anonymous/b18b5c39c18986d52ca64203b478fe60

What it means is that on desktop it shows up as 3 columns per row (33%), on tablet shows 2 columns per row (50%) and on mobile shows 1 column per row (100%).