.gallery {
  display: grid;
  grid-column-gap: 3rem;
  grid-template-columns: 1fr 1fr 1fr;
  margin-top: 2.5em;
}
.gallery img {
  max-width: 100%;
  height: 100%;
}
@media screen and (max-width: 768px) {
  .gallery img {
    max-width: 100%;
  }
}