.gallery {
  column-count: 3;
  column-gap: 10px;
  padding: 20px;
}

.gallery img {
  width: 100%;
  margin-bottom: 10px;
  display: block;
  break-inside: avoid;
}

@media (max-width: 900px) {
  .gallery {
    column-count: 2;
  }
}

@media (max-width: 600px) {
  .gallery {
    column-count: 1;
  }
}