#scroll_to_top { position: fixed; display: block; text-decoration: none; z-index:51; }
#scroll_to_top:hover { cursor:pointer;}
.arr_wrap {position: relative;}
.arr_interior {position: absolute;}
#scroll_to_top i{ margin: 0; line-height: 0; letter-spacing: 0; text-align:center}

#scroll_to_top.active.fadein { opacity:1; }
#scroll_to_top.inactive.fadein { opacity:0; }