.falls-3
  - for (var x = 0; x<100; x++)
    div(
    class="item"
    style=`height:${parseInt(Math.random() * (400 - 50 + 1) + 50, 10)}px`)
      | #{x}

.falls-3{
  column-count: 4;
  column-width: 25%;
  column-span: 10px;
  padding-top: 10px;
}
.item{
  background-color: orange;
  margin: 0 0 10px;
  padding: 10px;
  font-size: 40px;
  color:white;
  break-inside: avoid;
  border-radius: 10px;
}