2_columns_offset_right — main column
colPos 0, span 8 → 680px.
This is the one layout whose columns deliberately do not add up to the row: 680 + 255 = 935, so 145px is left over on a 1080px row. Because .section-row is justify-content: space-between, that surplus lands in the gutter — measured 145px — rather than as empty space after the last column. The secondary column therefore sits flush with the right edge and the offset reads as a wide gap between the two columns, which is what the layout name describes.
Secondary column
colPos 2, span 3 → 255px, flush to the right edge of the row, with a 145px gutter to its left.