.zzsc{display: flex;
    width: 100%; height:30px; line-height:30px;  position:relative; bottom: 0;}
.zzsc li a{ color:#fff; text-decoration:none; display:block; float:left; height:30px; line-height:30px; padding:0px 15px; font-size:12px;background:#636871; width: 100%; box-sizing: border-box}
.zzsc li a:hover{ background:#4b505a;}
.zzsc li{float:left;position:relative; height:30px; line-height:30px;     flex: 1;}
.zzsc li .second{position:absolute;left:0;display:none;}