Row 1, Column 1 of 2
A nested table is one way of creating a grid...
...with nice borders that are the same width all the way around...
Row 2, Column 1 of 1
...it's sort-of responsive in that the table narrows, but it can't collapse columns into rows of single columns, of course!
This uses w3-cell-row in w3css v4...
Row 1, Column 2 of 2
...I nearly have the same width all the way around (but doubles up between rows)
...and it's responsive