.new-sohu-btn{width:36px;height:267px;position:fixed;left:50%;bottom:50px;margin-left:495px;}
.new-sohu-btn a{display:block;width:100%;height:100%;overflow:hidden;line-height:5000px;background:url(/sohu../images20170110/bg04.png) no-repeat 0 0;}
.new-sohu-btn a:hover{background-position:-40px 0;}