.gallery {
  display: grid;
  grid-template-columns: repeat(auto-fill, 100px);
  grid-auto-rows: 100px;
  grid-auto-flow: dense;
}

.item {
  overflow: hidden;
  display: grid;
  grid-template-columns: 1;
  grid-template-rows: 1;
}

.item img {
  grid-column: 1 / -1;
  grid-row: 1 / -1;
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.item__overlay {
  background: #ffc60032;
  grid-column: 1 / -1;
  grid-row: 1 / -1;
  position: relative;
  display: grid;
  justify-items: center;
  align-items: center;
  transition: 0.2s;
  transform: translateY(100%);
}

.item:hover .item__overlay {
  transform: translateY(0);
}

.item__overlay button {
  border: 2px solid white;
  color: white;
  text-transform: uppercase;
  background: rgba(0, 0, 0, 0.7);
  padding: 5px;
}

.item.v2 {
  grid-row: span 2;
}

.item.v3 {
  grid-row: span 3;
}

.item.v4 {
  grid-row: span 4;
}

.item.h2 {
  grid-column: span 2;
}

.item.h3 {
  grid-column: span 3;
}

.item.h4 {
  grid-column: span 4;
}