Change the number of columns and rows in a grid as the number of items increase

Question

I have to design a responsive grid.
The grid should change based on the number of items (instead of the size of the screen).

From 5 to 6 items should be 2x3,
fro

Answer 1

Implicit columns creation can do this. You can consider nth-child()/nth-last-child() to create a new column when you reach a specific number of columns:

.container {
  display:inline-grid;
  grid-auto-columns:1fr;
  width:100px;
  vertical-align:top;
}
.container > :nth-child(2) {
  grid-column:2;
}

.container > :nth-last-child(5) ~ :nth-child(3),
.container > :nth-last-child(7) ~ :nth-child(3), /* 7 = 5 + 2 */
.container > :nth-last-child(9) ~ :nth-child(3){ /* 9 = 7 + 2 */
 grid-column:3;
}

.container > :nth-last-child(10) ~ :nth-child(4),
.container > :nth-last-child(13) ~ :nth-child(4), /* 13 = 10 + 3 */
.container > :nth-last-child(16) ~ :nth-child(4){ /* 16 = 13 + 3 */
 grid-column:4;
}

.container > :nth-last-child(17) ~ :nth-child(5),
.container > :nth-last-child(21) ~ :nth-child(5), /* 21 = 17 + 4 */
.container > :nth-last-child(25) ~ :nth-child(5){ /* 25 = 21 + 4 */
 grid-column:5;
}

.container > * {
  border:1px solid red;
}
.container > *::before {
  content:"";
  display:inline-block;
  padding-top:100%;
}