.bookViewer{margin:5px auto 0 auto}.bookViewer .page{background:#FFF}.secondaryToolbarButton.bookFlip::before{content:url(secondaryToolbarButton-bookFlip.png)}@media screen and (-webkit-min-device-pixel-ratio:1.1),screen and (min-resolution:1.1dppx){.secondaryToolbarButton.bookFlip::before{content:url(secondaryToolbarButton-bookFlip@2x.png)}}