<h1>Masonry - columnWidth</h1>

<div class="grid">
  <div class="grid-item"></div>
  <div class="grid-item grid-item--width2 grid-item--height2"></div>
  <div class="grid-item grid-item--height3"></div>
  <div class="grid-item grid-item--height2"></div>
  <div class="grid-item grid-item--width3"></div>
  <div class="grid-item"></div>
  <div class="grid-item"></div>
  <div class="grid-item grid-item--height2"></div>
  <div class="grid-item grid-item--width2 grid-item--height3"></div>
  <div class="grid-item"></div>
  <div class="grid-item grid-item--height2"></div>
  <div class="grid-item"></div>
  <div class="grid-item grid-item--width2 grid-item--height2"></div>
  <div class="grid-item grid-item--width2"></div>
  <div class="grid-item"></div>
  <div class="grid-item grid-item--height2"></div>
  <div class="grid-item"></div>
  <div class="grid-item"></div>
  <div class="grid-item grid-item--height3"></div>
  <div class="grid-item grid-item--height2"></div>
  <div class="grid-item"></div>
  <div class="grid-item"></div>
  <div class="grid-item grid-item--height2"></div>
</div>

* { box-sizing: border-box; }

body { font-family: sans-serif; }

/* ---- grid ---- */

.grid {
  background: #EEE;
  max-width: 1200px;
}

/* clearfix */
.grid:after {
  content: '';
  display: block;
  clear: both;
}

/* ---- grid-item ---- */

.grid-item {
  width: 160px;
  height: 120px;
  float: left;
  background: #D26;
  border: 2px solid #333;
  border-color: hsla(0, 0%, 0%, 0.5);
  border-radius: 5px;
}

.grid-item--width2 { width: 320px; }
.grid-item--width3 { width: 480px; }
.grid-item--width4 { width: 640px; }

.grid-item--height2 { height: 200px; }
.grid-item--height3 { height: 260px; }
.grid-item--height4 { height: 360px; }

// external js: masonry.pkgd.js

$('.grid').masonry({
  itemSelector: '.grid-item',
  columnWidth: 160
});