第一种
table th:nth-child(n+3):hover::after{content:'';//指标:《风险筛选值。污染评价:污染风险低width:250px;height:800px;border:5px solid white;background: url('../../../../assets/images/afterHover/grade.png') top center no-repeat; background-size:100% auto;position:absolute;top:0px;left:-10px;z-index:99999999;vertical-align: baseline;}
第二种:
table th:nth-child(n+3):hover::after{content:'等级Ⅰ:指标:≤风险筛选值。污染评价:污染风险低;等级Ⅱ:指标:>风险筛选值,≤风险管制值。污染评价:存在污染风险;等级Ⅲ:指标:>风险筛选值。污染评价:污染风险高;';//等级Ⅰ:指标:≤风险筛选值。污染评价:污染风险低;等级Ⅱ:指标:>风险筛选值,≤风险管制值。污染评价:存在污染风险;等级Ⅲ:指标:>风险筛选值。污染评价:污染风险高;width:300px;height:800px;border:5px solid white;color:white;background:green;//background: url('../../../../assets/images/afterHover/grade.png') top center no-repeat; background-size:100% auto;position:absolute;top:30px;left:0px;z-index:99999999;vertical-align: baseline;}