/* PageFlip polish: resting spine only; no geometry or raster changes. */
#viewer #book.folio-resting-spread .folio-pdf-page.--simple::after{content:"";position:absolute;top:0;bottom:0;width:10px;pointer-events:none;z-index:2}
#viewer #book.folio-resting-spread .folio-pdf-page.--simple.--left::after{right:0;background:linear-gradient(to left,rgba(8,16,29,.07),rgba(8,16,29,0))}
#viewer #book.folio-resting-spread .folio-pdf-page.--simple.--right::after{left:0;background:linear-gradient(to right,rgba(8,16,29,.06),rgba(8,16,29,0))}