body {
  font-family: Arial, sans-serif;
  margin: 40px;
}

.gallery {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 20px;
  max-width: 900px;
}

.gallery img {
  width: 100%;
  height: auto;
  display: block;
}

.last-photo {
  grid-column: 1 / 3;
  justify-self: center;
  width: 48%;
}