body {
  font-family: Arial, sans-serif;
  padding: 20px;
}

h1 {
  text-align: center;
}

button {
  display: block;
  margin: 20px auto;
  padding: 10px 20px;
  font-size: 16px;
  cursor: pointer;
}

.gallery {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
  grid-gap: 20px;
}


img.lazy {
  height: 200px;
  width: 100%;
  background-color: #f0f0f0;
  object-fit: cover;
  transition: opacity 0.5s ease-in-out;
  opacity: 0;
}


img.loaded {
  opacity: 1;
}