#clockdiv {
text-align: left;
}
#btn_home {

width: 40px;

height: 40px;

display: block;

position: fixed;

left: 67%;

bottom: 200px;

background: url("https://files.cnblogs.com/files/siwuxie095/home.bmp" )no-repeat left top;

}

   

/* 刷新页面 */

#btn_refresh {

width: 40px;

height: 40px;

display: block;

position: fixed;

left: 67%;

bottom: 160px;

background: url("https://files.cnblogs.com/files/siwuxie095/refresh.bmp" )no-repeat left top;

}

   

/* 关注博主 */

#btn_follow {

width: 40px;

height: 40px;

display: block;

position: fixed;

left: 67%;

bottom: 120px;

background: url("https://files.cnblogs.com/files/siwuxie095/follow.bmp" )no-repeat left top;

}

   

/* 邮件联系 */

#btn_at {

width: 40px;

height: 40px;

display: block;

position: fixed;

left: 67%;

bottom: 80px;

background: url("https://files.cnblogs.com/files/siwuxie095/at.bmp" )no-repeat left top;

}

   

/* 回到顶部 */

#btn_top {

width: 40px;

height: 40px;

display: none;

position: fixed;

left: 67%;

bottom: 40px;

background: url("https://files.cnblogs.com/files/siwuxie095/top.bmp" )no-repeat left top;

}