.margin-center{max-width:7.5rem;margin-left:auto;margin-right:auto}body{background:#f8f8f8}#app{max-width:750px;margin-left:auto!important;margin-right:auto!important}.img-block{display:block;max-width:100%}.product-install-item{background:#fff;border-bottom:1px solid #ebebeb}.product-install-item .hd{position:relative;z-index:10;display:-webkit-box;display:-webkit-flex;display:-ms-flexbox;display:flex;-webkit-box-align:center;-webkit-align-items:center;-ms-flex-align:center;align-items:center;-webkit-box-pack:justify;-webkit-justify-content:space-between;-ms-flex-pack:justify;justify-content:space-between;padding:.38rem .36rem}.product-install-item .hd .title{font-size:.36rem;font-weight:700;pointer-events:none}.product-install-item .video-sec{margin:.22rem auto .8rem;width:6.8rem}.product-install-item .video-sec p{font-family:PingFang SC;font-weight:400;font-size:.28rem;color:#000;margin:0 0 .2rem}.product-install-item .video-sec .video-play{height:3.82rem;overflow:hidden;border-radius:.08rem;max-width:750px;margin:0 auto;background:#000}.product-install-item .video-sec .play-btn{position:absolute;top:50%;left:50%;-webkit-transform:translate(-50%,-50%);transform:translate(-50%,-50%);width:1.2rem;height:1.2rem}.product-install-item .bd{margin-left:.32rem;margin-right:.32rem;height:0;overflow:hidden;-webkit-transition:height .1s ease-in-out;transition:height .1s ease-in-out}.product-install-item.toggle .bd{padding-top:20px;height:auto}.tech-title{margin-bottom:.36rem;font-size:.32rem;font-weight:700;text-align:center}.content-tech{padding-top:.3rem;padding-bottom:.3rem;border-top:1px solid #ebebeb;display:-webkit-box;display:-webkit-flex;display:-ms-flexbox;display:flex;-webkit-box-align:center;-webkit-align-items:center;-ms-flex-align:center;align-items:center;-webkit-box-pack:justify;-webkit-justify-content:space-between;-ms-flex-pack:justify;justify-content:space-between}.content-tech .span-left{width:25%;-webkit-flex-shrink:0;-ms-flex-negative:0;flex-shrink:0}.content-tech .span-right{padding-left:.3rem;text-align:right}