box1
box2
box3
box4
box5
box6
box7
reset
grid-column: 1;
grid-column: 2;
grid-column: 3;
grid-column: 4;
grid-column: 1 / 3;
grid-column: 1 / 4;
grid-column: 2 / 3;
grid-column: 2 / 4;
grid-column: 3 / 4;
grid-column: 2 / -1;
grid-column: 3 / -1;