@-moz-document url-prefix(http://www.tumblr.com/),url-prefix(https://www.tumblr.com/){

#return_to_top .return_to_top_icon{
background: url('http://25.media.tumblr.com/tumblr_mam3e37V3f1qa0t06o7_100.png') no-repeat transparent!important}}