grid-template-columns: 60px [A] 60px 60px;
grid-auto-columns: 40px;
grid-column-start:
-1
4
-2
-3
-4
-5
A -1
B -1
A -2
A -3
A -4
A -5
A
B
A 1
A 2
A 3
A 4
A 5
grid-column-end:
-1
4
-5
-4
-3
-2
A -1
B -1
A -2
A -3
A -4
A -5
A
B
A 1
A 2
A 3
A 4
A 5
grid-column: / span A 2
-1
4
-2
-3
-4
-5
A -1
B -1
A -2
A -3
A -4
A -5
A
B
A 1
A 2
A 3
A 4
A 5