.grid-gallery {
  --size: 100px;
  display: grid;
  grid-template-columns: repeat(6, var(--size));
  grid-auto-rows: var(--size);
  gap: 3px;
  place-items: start center;
  margin-bottom: var(--size);
}

.grid-gallery img {
  width: calc(var(--size) * 2);
  height: calc(var(--size) * 2);
  object-fit: cover;
  grid-column: auto / span 2;
  border-radius: 3px;
  clip-path: path("M90,10 C100,0 100,0 110,10 190,90 190,90 190,90 200,100 200,100 190,110 190,110 110,190 110,190 100,200 100,200 90,190 90,190 10,110 10,110 0,100 0,100 10,90Z"); 
}


.grid-gallery img:nth-child(5n - 1) { 
  grid-column: 2 / span 2 
}

.grid-gallery:has(img:hover) img:not(:hover) {
  filter: brightness(0.5) contrast(0.5);
}

.grid-gallery img {
  /* ... */
  transition: clip-path 0.25s, filter 0.75s;
}

.grid-gallery img:hover {
  clip-path: path("M0,0 C0,0 200,0 200,0 200,0 200,100 200,100 200,100 200,200 200,200 200,200 100,200 100,200 100,200 100,200 0,200 0,200 0,100 0,100 0,100 0,100 0,100Z");
  transition: clip-path 0.25s, filter 0.25s;
  z-index: 1;
}

.grid-gallery a:focus {
  outline: 1px dashed black;
  outline-offset: -5px;
}