#return-to-top {
   position: fixed;
   bottom: 20px;
   right: 20px;
   background: rgb(0, 0, 0);
   background: rgba(0, 0, 0, 0.7);
   width: 50px;
   height: 50px;
   display: block;
   text-decoration: none;
   -webkit-border-radius: 35px;
   -moz-border-radius: 35px;
   border-radius: 35px;
   display: none;
   -webkit-transition: all 0.3s linear;
   -moz-transition: all 0.3s ease;
   -ms-transition: all 0.3s ease;
   -o-transition: all 0.3s ease;
   transition: all 0.3s ease;
}

#return-to-top i {
   color: #fff;
   margin: 0;
   position: relative;
   left: 16px;
   top: 13px;
   font-size: 19px;
   -webkit-transition: all 0.3s ease;
   -moz-transition: all 0.3s ease;
   -ms-transition: all 0.3s ease;
   -o-transition: all 0.3s ease;
   transition: all 0.3s ease;
}

#return-to-top:hover {
   background: rgba(0, 0, 0, 0.9);
}

#return-to-top:hover i {
   color: #fff;
   top: 5px;
}