.grid {
  max-width: 1200px;
  margin: auto;
}

.grid-sizer,
.grid-item {
  width: 33%;
}

.grid-item {
  margin-bottom: 16px;
  padding: 8px;
  box-sizing: border-box;
}

.grid-item img {
  width: 100%;
  display: block;
  border-radius: 8px;
}

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

@media (max-width: 480px) {
  .grid-sizer,
  .grid-item {
    width: 100%;
  }
}