.backToTop { bottom: 40px; color: #000000; cursor: pointer; font: 12px Arial; position: fixed; text-align: center; text-decoration: none; right: 20px; z-index: 2222; -moz-transition: opacity 0.2s linear; -o-transition: opacity 0.2s linear; -webkit-transition: opacity 0.2s linear; transition: opacity 0.2s linear; }
.backToTop.fadein { filter: progid:DXImageTransform.Microsoft.Alpha(enabled=false); opacity: 1; }
.backToTop.fadeout { filter: progid:DXImageTransform.Microsoft.Alpha(Opacity=0); opacity: 0; }

.catalog-product-view .backToTop {
  z-index: 0;
}