.opf-book{box-sizing:border-box;perspective:2000px;touch-action:pan-y;display:block;position:relative}.opf-book--top,.opf-book--bottom{touch-action:pan-x}.opf-page{transform-style:preserve-3d;display:none;position:absolute}.opf-page--turning{outline:1px solid var(--opf-page-edge,#0003);outline-offset:-1px}.opf-sheet,.opf-shadow{pointer-events:none;position:absolute;top:0;left:0}