* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

.wrapper {
  background-color: black;
  padding: 0.5rem;
}

.gallery {
  column-count: 1;
  column-gap: 0.5rem;
  list-style-type: none;

  & li {
    break-inside: avoid;
    min-height: 30vmin;
    margin-bottom: 0.5rem;
    background-color: #222;

    & img {
      display: block;
      width: 100%;
      object-fit: cover;
      filter: grayscale(100%);
      transition: opacity 0.3s;
    }
  }
}


@media (width > 500px) {
  .gallery {
    columns: 2;
  }
}

@media (width > 900px) {
  .gallery {
    columns: 3;
  }
}


.wrapper {
  padding: 20px;
}

.gallery {
  columns: 4 200px;
  column-gap: 10px;
  list-style: none;
  padding: 0;
  margin: 0;
}

.gallery li {
  break-inside: avoid;
  margin-bottom: 10px;
}

.gallery img {
  width: 100%;
  display: block;
  transition: opacity .6s ease;
}