.book-container{background:var(--background);border-radius:.5rem;width:100%;padding:30px;position:relative;box-shadow:0 0 10px #0000001a}.book-spine{z-index:10;opacity:.3;background:linear-gradient(90deg,#afafaf 10%,#fff 100%);width:5px;height:98%;position:absolute;top:0;left:1px;box-shadow:inset 4px 4px 5px}