移动端图片轮播最外层宽度影响同级div宽度

     <div class="_CPTP_LB">
        <ul>
            <li><img src="../img/1.png"></li>
            <li><img src="../img/1.png"></li>
            <li><img src="../img/1.png"></li>
            <li><img src="../img/1.png"></li>
         </ul>
      </div>

　　

._CPTP_LB{width: 100%;height: 150px;background-color:#fff;overflow:hidden;float:left;position: relative;}
 ._CPTP_LB>ul{height: 100%;float:left;position: absolute;}
._CPTP_LB>ul>li{width: 280px;float:left;margin-right:20px;}
._CPTP_LB>ul>li:nth-of-type(1){margin-left:20px;} 
._CPTP_LB>ul>li>img{width: 100%;}