h1 {
  display: flex;
  justify-content: center;
}

.gallery {
  display: grid;
  grid-template-columns: 1fr 1fr 1fr;
  grid-gap: 20px;
  padding: 20px 20px 20px 20px;
}

img {
  width: 100%;
}

@media (max-width: 750px) {
  .gallery {
    grid-template-columns: 1fr;
    padding: 20px 0;
  }
}