a,aside,audio,body,button,canvas,dd,div,dl,dt,footer,form,h1,h2,h3,h4,h5,h6,header,html,img,input,label,li,main,nav,ol,option,p,section,select,span,table,tbody,td,textarea,tfoot,th,thead,tr,ul,video{margin:0;padding:0;border:0;outline:0;box-sizing:border-box}body,html{width:100%;height:100%;-webkit-overflow-scrolling:touch}body{font-family:-apple-system,BlinkMacSystemFont,Helvetica Neue,Helvetica,Segoe UI,Arial,Roboto,PingFang SC,Hiragino Sans GB,Microsoft Yahei,sans-serif;-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale;-webkit-user-select:none;-moz-user-select:none;-ms-user-select:none;user-select:none}a{text-decoration:none}li{list-style:none}input::-moz-placeholder{color:#999}input:-ms-input-placeholder{color:#999}input::placeholder{color:#999}select{-webkit-appearance:none}#mask{position:fixed;height:100%;width:100%;max-width:750px;left:0;top:0;right:0;bottom:0;z-index:999;background:rgba(0,0,0,.7);margin:auto;overflow-y:auto}#mask .mask-content{width:100%;padding-bottom:.4rem}#mask .mask-content .img{width:6.78rem;margin:auto;margin-top:2.06rem;position:relative}#mask .mask-content .img .bg{width:100%}#mask .mask-content .img .close{position:absolute;width:1.02rem;top:-.44rem;right:-.33rem}#mask .mask-content .btn-down{width:3.02rem;height:.8rem;box-sizing:border-box;border:1px solid #fff;display:flex;justify-content:center;align-items:center;margin:auto;margin-top:.55rem;color:#fff;font-size:.3rem;border-radius:.4rem}