#key - CSS masonry with flexbox, :nth-child(), and order | Tobias Ahlin

.container {
  display: flex;
  flex-flow: column wrap;
  align-content: space-between;
  /* Your container needs a fixed height, and it 
   * needs to be taller than your tallest column. */
  height: 600px; 
}

.item {
  width: 32%;
  margin-bottom: 2%; /* Optional */
}

/* Re-order items into 3 rows */
.item:nth-child(3n+1) { order: 1; }
.item:nth-child(3n+2) { order: 2; }
.item:nth-child(3n)   { order: 3; }

/* Force new columns */
.container::before,
.container::after {
  content: "";
  flex-basis: 100%;
  width: 0;
  order: 2;
}



...
4 colonnes .container { display: flex; flex-flow: column wrap; align-content: space-between; /* Your container needs a fixed height, and it * needs to be taller than your tallest column. */ height: 600px; } .item { width:24%; margin-bottom: 2%; /* Optional */ } /* Re-order items into 4 rows */ .item:nth-child(4n+1) { order: 1; } .item:nth-child(4n+2) { order: 2; } .item:nth-child(4n+3) { order: 3; } .item:nth-child(4n) { order: 4; } /* Force new columns */ .break { content: ""; flex-basis: 100%; width: 0; margin: 0; }