Spanning Items Across Multiple Columns or Rows in CSS Grid
In CSS Grid, you can make an item span multiple columns or rows using the grid-column and grid-row properties. These properties define how many grid tracks (columns or rows) an item should stretch across.
Use grid-column: start / end; to define which columns an item spans across.
Use grid-row: start / end; to define which rows an item spans across.
You can also use the span keyword to specify how many tracks the item should cover (e.g., grid-column: span 2;).
Grid lines are numbered starting from 1, and you can mix numbers and the span keyword for flexible positioning.