.masonry-grid-item {
  width: 200px;
}

.masonry-grid-item--width2 {
  width: 400px;
}

.masonry-grid {
  background: #DDD;
}

/* clear fix */
.masonry-grid:after {
  content: '';
  display: block;
  clear: both;
}

/* ---- .masonry-grid-item ---- */

.masonry-grid-sizer,
.masonry-grid-item {
  width: 33.333%;
}

.masonry-grid-item {
  float: left;
}

.masonry-grid-item img {
  display: block;
  width: 100%;
}