.r_b{font-family: 'Microsoft YaHei', '微软雅黑';position: fixed;right:0px;top:240px;height:276px;_position: absolute;
_bottom: auto;
_top: expression(eval(document.documentElement.scrollTop+document.documentElement.clientHeight-this.offsetHeight-(parseInt(this.currentStyle.marginTop,200)||0)-(parseInt(this.currentStyle.marginBottom,100)||0))); z-index:999;}
.r_b li{position: relative;width:68px;height:68px;}
.r_b img{width: 68px; height: 68px;}
.r_b li p{position: absolute;width:100%;bottom:0;font-size: 12px;color:#fff;line-height: 28px;text-align: center;}
.r_b .phone{position:relative;_position:relative;}
.r_b .wechat{position:relative;_position:relative;}
.r_b .dh{position: absolute;_position:absolute;overflow:hidden;left:68px;top:0;width:200px;height:68px;background:#2b78d9;font-size: 25px;color:#fff;line-height: 68px;text-align: center;transition:0.2s;}
.r_b .wechat .dh{position: absolute;_position:absolute;overflow:hidden;left:68px;top:0;width:250px;height:250px;background:#2b78d9;font-size: 25px;color:#fff;line-height: 68px;text-align: center;transition:0.2s;}
.r_b .phone:hover .dh{left:-200px;}
.r_b .wechat:hover .dh{left:-250px;}
.ffk{cursor: pointer;}