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

body {
  background: #f3f3f3;
  min-height: 100vh;
}

/* GRID */
.grid-container {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(120px, 1fr));
  width: 100%;
}

/* BOX */
.grid-item {
  aspect-ratio: 1/1;
  border: 1px solid #555;
  overflow: hidden;
}

/* IMAGE */
.grid-item img {
  width: 100%;
  height: 100%;
  object-fit: cover;

  /* Black & White */
  filter: grayscale(100%);

  transition: 0.4s ease;
}

/* Hover Effect */
.grid-item:hover img {
  filter: grayscale(0%);
  transform: scale(1.05);
}