/* Back To Top  
  ================================================== */  
  #backtotop {  
  position: fixed;  
  right:0px;  
  display:none;  
  bottom: 18px;  
  margin: 0 75px 0 0;  
  }  

  #backtotop a {  
  text-decoration:none;  
  border:0 none;  
  display:block;  
  width:45px;  
  height:45px;  
  background: url(http://http://bestonucoz.ru/img/back_to_top_btn.png) no-repeat 50% 50%;  
  background-color:#95ae20;  
  -webkit-transition: all 0.1s ease-in-out;  
  -moz-transition: all 0.1s ease-in-out;  
  -o-transition: all 0.1s ease-in-out;  
  -ms-transition: all 0.1s ease-in-out;  
  transition: all 0.1s ease-in-out;  
  }  

  #backtotop a:hover {background-color:#404040;}  
  /*================================================= */

<div id="backtotop" style="display: block;"><a href="#"></a></div>  
  <script type="text/javascript" src="http://http://bestonucoz.ru/js/up.js"></script>