.book-container{position:relative;width:100%;padding:30px;background:var(--background);box-shadow:0 0 10px rgba(0,0,0,.1);border-radius:.5rem}.book-spine{position:absolute;top:0;left:1px;height:98%;width:5px;background:linear-gradient(90deg,rgba(175,175,175,1) 10%,rgba(255,255,255,1));z-index:10;box-shadow:inset 4px 4px 5px;opacity:.3}