/*  Back Top Button  */
#back-top {
 position: fixed;
 bottom:30px;
 left: 50px;
}
#back-top a {
  width: 54px;
  height: 54px;
  display: block;
  background: #ddd url(/img/Back-Top_Arrow.png) no-repeat center center;
  background-color: #aaa;
  -webkit-border-radius: 7px;
  -moz-border-radius: 7px;
  border-radius: 7px;
  -webkit-transition: 1s;
  -moz-transition: 1s;
  transition: 1s;
  opacity: 0.6;
  filter: alpha(opacity=60);
}
#back-top a:hover {
  background-color: #AAA;
  opacity:1;
  filter: alpha(opacity=60);
  }
/*  Back Top Button  End */

/*  Back Top Button  */
#back-top {
 position: fixed;
 bottom:30px;
 right: 50px;
 z-index: 4;
}
#back-top a {
  width: 54px;
  height: 54px;
  display: block;
  background: #fff url(/img/Back-Top_Arrow.png) no-repeat center center;
  background-color: #ddd;
  -webkit-border-radius: 7px;
  -moz-border-radius: 7px;
  border-radius: 27px;
  -webkit-transition: 0.6s;
  -moz-transition: 0.6s;
  transition: 0.6s;
  opacity: 0.6;
  filter: alpha(opacity=60);
}
#back-top a:hover {
  background-color: #555;
  opacity:0.8;
  filter: alpha(opacity=80);
  }
/*  Back Top Button  End */

Change the style and position of back-top button
Change the style and position of back-top button

1. Change the style and position of back-top button
