.grid {
  background: transparent;
  width: 100%;
}

/* clear fix */

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

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

@media (min-width: 768px) {
  .grid-sizer, .grid-item {
    width: 33.333%;
  }
}

@media (max-width: 768px) {
  .grid-sizer, .grid-item {
    width: 50%;
  }
}

.grid-item {
  float: left;
}

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