body {
     padding: 0;
     margin: 0;
 }
 
 ul {
     padding: 0;
 }
  @media (min-width: 980px) and (max-width: 2000px){
	  /* 轮播图 */
	   .border .banner {
	       background: url("../img/technical/banner.png") no-repeat;
	       /* height: 600px; */
	       background-size: 100% 100%;
	       width: 100%;
	   }
	   
	  .bannerBackground div {
	      background: url('../img/technical/banner.png') no-repeat top center;
	      background-size: 100% 100%;
	  }
	  
	  .whole {
	      width: 100%;
	  }
	  
	  .whole .banner {
	      height: 600px;
	  }
	  
	  .whole .banner .nav {
	      padding: 2% 3%;
	      width: 90%;
	      display: flex;
	      justify-content: space-between;
	  }
	  
	  .whole .banner .nav .nav_logo {
	      width: 100%;
	  }
	  
	  .whole .banner .nav .nav_flex {
	      width: 50%;
	      line-height: 100px;
	  }
	  
	  .whole .banner .nav .nav_flex .nav_ul {
	      display: flex;
	      justify-content: space-around;
	  }
	  
	  .whole .banner .nav .phone_nav {
	      display: none;
	  }
	  
	  .whole .banner .nav .nav_ul {
	      color: #fff;
	      position: relative;
	  }
	  
	  .whole .banner .nav .nav_ul .nav_drop {
	      color: #000;
	      border-radius: 5px;
	      position: relative;
	      text-align: center;
	      top: -20px;
	      left: -15px;
	      width: 100px;
	      height: 100px;
	      background: #ffffff;
	      line-height: 30px;
	      padding: 1% 3%;
	  }
	  
	  .whole .banner .nav .nav_ul li .nav_drop {
	      opacity: 0;
	      transition: 1s;
	  }
	  
	  .whole .banner .nav .nav_ul li .nav_drop li {
	      width: 100%;
	  }
	  
	  .whole .banner .nav .nav_ul li:hover .nav_drop {
	      opacity: 1;
	  }
  }
  
  /*屏幕小于1024 */
  
  @media screen and (max-width: 980px) {
	 
	  .phone_img {
	          width: 32%;
	          float: right;
	      }
	      .lis {
	          position: absolute;
	          top: 75%;
	          left: 0px;
	          line-height: 45px;
	          font-size: 16px;
	          background: #fff;
	          padding-bottom: 30px;
	      }
	      .lis div {
	          width: 100vh;
	          padding-left: 20px;
	      }
	      .layui-carousel {
	          height: 250px !important;
	      }
	      .navwhole .banner {
	          height: 280px;
	      }
      .whole {
          width: 100%;
      }
      .whole .banner {
          height: 600px;
      }
      .whole .banner .nav {
          width: 94%;
          padding: 3%;
      }
      .whole .banner .nav .comp_img {
          width: 200px;
          float: left;
      }
      .whole .banner .nav .nav_logo {
          width: 80%;
      }
      .whole .banner .nav .nav_flex {
          display: none;
      }
      .whole .banner .nav .phone_nav {
          display: block;
      }
      .whole .banner .nav .phone_nav .nav_drop .phone_li {
          font-size: 9px;
          width: 37%;
          margin: 0px 0px;
          float: right;
      }
      .whole .banner .nav .phone_nav .nav_drop .phone_li .phone_img {
          text-align: right;
          width: 80%;
      }
      .whole .banner .nav .phone_nav .nav_drop .phone_li .phone_navdis {
          width: 100%;
          background: #fff;
          opacity: 0;
          transition: 1s;
      }
      .whole .banner .nav .phone_nav .nav_drop .phone_li .phone_navdis li {
          height: 35px;
          text-align: center;
          position: relative;
      }
      .whole .banner .nav .phone_nav .nav_drop .phone_li .phone_navdis li ul {
          width: 80%;
          position: absolute;
          left: -50px;
          height: 30px;
          background: #fff;
          opacity: 0;
          transition: 1s;
          line-height: 30px;
      }
      .whole .banner .nav .phone_nav .nav_drop .phone_li .phone_navdis li:hover ul {
          opacity: 1;
      }
      .whole .banner .nav .phone_nav .nav_drop .phone_li:hover .phone_navdis {
          opacity: 1;
      }
      .whole .banner .nav .phone_nav .nav_drop .nav_drop {
          width: 50%;
      }
  }
  
 
  
  .border .banner {
      background: url("../img/technical/banner.png") no-repeat;
      /* height: 600px; */
      background-size: 100% 100%;
      width: 100%;
  }
  
  .border .introduction {
      /* border: 1px solid #000; */
      /* margin-top: 50px; */
      display: flex;
      justify-content: space-between;
      align-items: center;
      width: 85%;
      margin: 0 auto;
      background: #dddddd;
      border-radius: 10px;
      padding: 2.5%;
      line-height: 30px;
  }
  
  .border .introduction h4 {
      font-size: 38px;
      padding-bottom: 6%;
  }
  
  .border .technical_support {
      width: 90%;
      /* padding: 2% 5%; */
      margin: 0 auto;
      /* border: 1px solid #000; */
      margin-bottom: 60px;
  }
  /* .border .technical_support .technical_content { */
  /* padding: 2%; */
  /* border: 1px solid #000; */
  /* } */
  
  .border .technical_support .technical_content p {
      font-size: 18px;
  }
  
  .border .technical_formula {
      padding: 2% 0;
      line-height: 25px;
  }
  
  .border .technical_formula .technical_formula li {
      font-size: 18px;
  }
  
  .border .technical_support h5 {
      /* padding: 0.5% 0 0.5% 0; */
      font-size: 40px;
      font-weight: 540;
      text-align: center;
  }
  
  @media screen and (max-width: 980px) {
      /* 轮播图 */
      .bannerBackground div {
          background: url('../img/technical/banner.png') no-repeat top center;
      }
      .border {
          width: 100%;
      }
      .download {
          margin: 3% 0;
      }
      .introduction {
          display: flex;
          flex-wrap: wrap;
      }
      .introduction .introduction_content {
          text-align: center;
      }
      .introduction .introduction_content .introduction_title {
          font-size: 30px;
      }
      .introduction img {
          width: 100%;
      }
  }