#chw-scroll-top.affix-top {
    position: absolute; /* allows it to "slide" up into view */
    bottom: -82px; /* negative of the offset - height of link element */
    right: 10px; /* padding from the left side of the window */
}
#chw-scroll-top.affix {
    position: fixed; /* keeps it on the bottom once in view */
    bottom: 18px; /* height of link element */
    right: 10px; /* padding from the left side of the window */
}