body {
  font-family: sans-serif;
  background: #111;
  color: #eee;
  margin: 2rem;
}

h1 {
  text-align: center;
}

.gallery {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(180px, 1fr));
  gap: 1rem;
  max-width: 1000px;
  margin: 0 auto;
}

.gallery img {
  width: 100%;
  height: auto;
  display: block;
  border: 2px solid #333;
  background: #000;
}

.gallery a:hover img {
  border-color: #888;
}