box1
box2
box3
reset grid-template-areas: "box1 box1 box1" "box2 box3 box3" "box2 box3 box3"; grid-template-areas: "box2 box2 box1" "box2 box2 box3" "box2 box2 box3"; grid-template-areas: "box1 box1 ." "box1 box1 ." ". box2 box3";