.masonry-with-columns#masonry-with-columns
  - for i in (1..15)
    div #{i}
    
    

body {
  margin: 0;
  padding: 1rem;
}

.masonry-with-columns {
  display: flex;
  flex-direction: column;
  flex-wrap: wrap;
  max-height: 1000px;
  div {
    flex: 1 0 auto;
    background: #EC985A;
    color: white;
    margin: 0 1rem 1rem 0;
    text-align: center;
    font-family: system-ui;
    font-weight: 900;
    font-size: 2rem;
  } 
  @for $i from 1 through 36 { 
    div:nth-child(#{$i}) {
      $h: (random(400) + 100) + px;
      height: $h;
      line-height: $h;
    }
  }
}

const numCols = 3;
const colHeights = Array(numCols).fill(0);
const container = document.getElementById('masonry-with-columns');
Array.from(container.children).forEach((child, i) => {
  const order = i % numCols;
  child.style.order = order;
  colHeights[order] += parseFloat(child.clientHeight);
})
container.style.height = Math.max(...colHeights) + 'px';