div.gallery {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  padding-bottom: 3em;
}

div.gallery-item {
  margin: 0.5em;
  width: 20em;
  transition: 100ms ease-out;
}

div.gallery-item:hover {
  transform: scale(1.05);
}

div.gallery-item img {
  width: 100%;
  height: auto;
}