How to set border for second grid row ?

grid-template-columns: reepat(5, 1fr);
grid-template-rows: repeat(3, 1fr);
/* How to add **border: 1px solid #000** to the row 2 from first to the last column ? */

grid-template-columns: reepat(5, 1fr);
grid-template-rows: repeat(3, 1fr);
/* How to add **border: 1px solid #000** to the row 2 from first to the last column ? */