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

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

.masonry {
  div {
    float: left;
    width: 150px;
    background: #EC985A;
    color: white;
    margin: 0 0 20px 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;
    }
  }
}

document.addEventListener("DOMContentLoaded", function(event) {
  
  var elem = document.querySelector('.masonry');
  var msnry = new Masonry( elem, {
    // options
    itemSelector: 'div',
    columnWidth: 170
  });

});