*{
    margin: 0;
    padding: 0;
}
ul{
    list-style: none;
}
ul a {
    text-decoration: none;
    color: black;
}
.both{
    clear: both;
}
.top{
    width:100%; 
    height: 720px;
}
.nav{
    width: 100%;
    height:100px;
    background-color: #fff;
    position: relative;
    top:4%;
}
.logo{
    margin-left: 2%;
    width:20%;
    float:left;
}
.check{ color: #ff0000; text-align: center;}
.check a{ color:#ff0000}
.check::after{
  content: '';
  width: 80%;
  height: 1px;
  display: block;
  margin: 0 auto;
  border-bottom: 2px solid #ff0000;
  margin-top:-5px;
  transition: all .5s ease-out;
}
.check1{ color: #ff0000; text-align: center;}
.check1:after{
    content: '';
  width: 80%;
  height: 1px;
  display: block;
  margin: 0 auto;
  border-bottom: 2px solid #ff0000;
  margin-top:-5px;
}
.nav ul li{
    float:left;
    width:10%;
    text-align: center;
    line-height: 100px;
}
.footer{
    background-color: #e70012;
    width:100%;
    height:200px;
    margin-top: 5%;
   }
   .footer_logo{
        padding-top: 5%;
        padding-left: 15%;
        float: left;
   }
   .footer_logo img{
        width:200px;
   }
   .shuxian{
    float:left;
    width:2px;
    height:100px;
    border-left: #ffffff solid 2px;
    margin-left: 3%;
    margin-top: 3%;
   }
   .about_us{
    width:30%;
    float: left;
    color:#ffffff;
    margin-left: 3%;
    margin-top: 3%;
   }
   .about{
    font-size: 20px;
   }
   .l_about{
    float: left;
    padding-top: 5%;
    line-height: 200%;
   }
   .r_about{
    float: right;
    padding-top: 5%;
    line-height: 200%;
   }

   .media{
    width:20%;
    float: left;
    color:#ffffff;
    margin-left: 3%;
    margin-top: 3%;
   }

   .icon{
    padding-top: 10%;
   }