CSS滑动导航栏消息通知栏点小红点

.slidingTabs li{     position: relative; } .slidingTabsNotice::after{ /*未读消息提示，小圆圈*/     content: '.';     display: inline-block;     position: absolute;     top: -20PX;     font-size: 40PX;     color:red; } .slidingTabsNoticeBlank::after{ /*消息已读，小圆圈点击后变为白色*/     content: '.';     display: inline-block;     position: absolute;     top: -20PX;     font-size: 40PX;     color:white; }