#back-top {
     position: fixed;
     bottom: 25px;
     right: 20px;
     z-index: 99;
}
#back-top span {
     width: 50px;
     height: 64px;
     display: block;
     background:url(https://images.cnblogs.com/cnblogs_com/seanshao/855033/o_rocket.png) no-repeat center center;
}
#back-top a{outline:none}

/** 固定推荐按钮 **/
#div_digg{
  position:fixed;
  bottom:5px;
  width:80px;
  right:65px;
  border:2px solid #085;
  padding:10px;
  background-color:#fff;
  opacity:0.5;
  border-radius:5px 5px 5px 5px !important;
  box-shadow:0 0 0 1px #5F5A4B, 1px 1px 6px 1px rgba(10, 10, 0, 0.5);
  transition-duration: 0.5s;
}
#div_digg .diggit{
  margin-left:13px
}
#div_digg .buryit{
  display:none;
  margin-right:13px
}
#div_digg:hover{
  opacity:1;
}