.grid {
  margin: 0 auto;
}

.grid-item {
  width: 25%;
  padding: 5px;
}

.grid-item img {
  width: 100%;
  display: block;
  border-radius: 4px;
}

@media (max-width: 768px) {
  .grid-item {
    width: 33.33%;
  }
}

@media (max-width: 480px) {
  .grid-item {
    width: 50%;
  }
}