html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
}

header.is-scrolled {
  background: #fff;
  border-bottom: 1px solid #f3f4f6;
}

img[data-book-image] {
  display: block;
  visibility: hidden;
}

.book-image-slot {
  background: #e9e4dc;
}