#back-top {
position: fixed;
bottom: 30px;
right:1.0em;
z-index:150;
}
#back-top span {

display: block;
/*background: url('http://goo.gl/OYPgh') no-repeat;*/

background: url('../../images/pics/pfeil.png') no-repeat;
}

@media screen and (max-width: 47em) {
#back-top{
right:0.2em;
}
}