p#back-to-top{
    position:fixed;
    display:none;
    bottom:30px;
    right:280px;
}
p#back-to-top a{
    text-align:center;
    text-decoration:none;
    color:#e10601;
    display:block;
    width:64px;
    /*使用CSS3中的transition属性给跳转链接中的文字添加渐变效果*/
    -moz-transition:color 1s;
    -webkit-transition:color 1s;
    -o-transition:color 1s;
}
p#back-to-top a:hover{
    color:#e10601;
}
p#back-to-top a span{
    background:transparent url(/static/imgs/sprite.png?1202) no-repeat -25px -290px;
    border-radius:6px;
    display:block;
    height:64px;
    width:56px;
    margin-bottom:5px;
    /*使用CSS3中的transition属性给<span>标签背景颜色添加渐变效果*/
    -moz-transition:background 1s;
    -webkit-transition:background 1s;
    -o-transition:background 1s;
}
#back-to-top a:hover span{
    background:transparent url(/static/imgs/sprite.png?1202) no-repeat -25px -290px;
}


<style type="text/css"> 
#div_digg{
  position:fixed;
  bottom:5px;
  width:140px;
  right:390px;
  border:2px solid #6FA833;
  padding:10px;
  background-color:#fff;
  border-radius:5px 5px 5px 5px !important;
  box-shadow:0 0 0 1px #5F5A4B, 1px 1px 6px 1px rgba(10, 10, 0, 0.5);
}

</style>