/*--- SCROLL TOP ---*/
.scroll-top{
    float: right;
    width: 44px;
    height: 43px;
}

#back-top {
    width: 44px;
    height: 43px;
}

#back-top a {
    float: right;
    width: 44px;
    height: 43px;
    position: relative;
}

#back-top span {
    float: right;
    width: 44px;
    height: 43px;
    display: block;
    background: url(img/scroll-top.png) no-repeat top left;
    margin: 0;
    transition: .5s;
    -webkit-transition: .5s;
    -moz-transition: .5s;
    opacity:0.2;
    filter: alpha(opacity= 20);
}
#back-top span:hover { 
    opacity:1;
    filter: alpha(opacity= 100);
}