audiobookshelf-app/assets/app.css

.box-shadow-md {
  box-shadow: 2px 8px 6px #111111aa;
}

.box-shadow-lg-up {
  box-shadow: 0px -12px 8px #111111ee;
}

.box-shadow-xl {
  box-shadow: 2px 14px 8px #111111aa;
}

.box-shadow-book {
  box-shadow: 4px 1px 8px #11111166, -4px 1px 8px #11111166, 1px -4px 8px #11111166;
}