.gallery {
  display: flex;
  flex-wrap: wrap;
}

.gallery-image {
  width: 25%;
}

.gallery-image img {
  max-width: 80%;
  max-height: 50vh;
  display: block;
  margin: 1rem auto;
}

@media only screen and (max-width: 770px) {
  .gallery-image {
    width: 33%;
  }
}

@media only screen and (max-width: 500px) {
  .gallery {
    flex-direction: column;
  }

  .gallery-image {
    width: 100%;
  }
}