.adver{width:1200px;margin:0 auto;margin-bottom:10px;}
.adver a img {width:1200px;margin-top:5px;border:0;}
.product_detail{width:1200px;margin:0 auto;}
.product_div{min-height:calc(100vh - 246px)}
.product_brief{display: flex;}
.product_img img{width:320px;height:200px;flex-shrink: 0;margin-right:20px;}
.product_li h3{font-size: 16px;font-weight: bold}
.product_content img{max-width: 1200px;}
.product_content{font-size:16px; line-height:2em;margin-top:20px;}