columns
Appends a newspaper-style multi-column block: the children added in block flow into count equal-width columns, balanced so the columns end up roughly the same height while keeping source order.
The block participates in page breaking as a single unit — columns do not continue onto the next page. Split very long content into several columns { } blocks when it can exceed one page.
Parameters
count
number of columns; must be positive.
gap
horizontal space between adjacent columns.
spacing
vertical gap between items inside a column.