.random-book{--container-bg:linear-gradient(145deg,#0000001a,#fff9);--container-shadow:8px 8px 16px #0003,-8px -8px 16px #ffffffe6;background:var(--container-bg);box-shadow:var(--container-shadow);border-radius:20px;transition:transform .45s,box-shadow .45s;overflow:hidden}.random-book .left,.random-book .right{transition:opacity .28s,transform .28s}.random-book.is-switching .left,.random-book.is-switching .right{opacity:.68;transform:translateY(4px)}