What you don’t want to do is do the copy of the “content-wrapper” container and paste that if that is what you did because that is the actual page container.
Start off by adding this wrapper container:
(this is from my demo site) Then replace those three dots with three instances of the code below:
For each row you want to add, repeat all the steps above.
I took a quick look but it looks like you were also missing the closing on your first row.