html,body{
    border: 0;
    margin: 0;
    padding: 0;
}

.banner{
    background: url("../img/banner.jpg");
    height: 462px;
    background-repeat:no-repeat;
    background-color: #3b67e0;
    position: relative;
}
.main_box{
    position: relative;
    width: 1300px;
    margin: 0 auto;
}
.logo{
    position: absolute;
    top: 20px;
    left: 0;
}
.biaoyu{
    position: absolute;
    left: 0;
    top: 300px;
    font-size: 24px;
    font-weight: bold;
    color: #ffffff;
}
.menu_box{
    position: absolute;
    right: 0;
    top: 30px;
}
.menu_box a{
    color: #ffffff;
    text-decoration: none;
    font-size: 20px;
    margin-left: 50px;
}
.menu_title{
    text-align: center;
    font-size: 16px;
    font-weight: bold;
    line-height: 80px;
}
.menu_sup_title{
    text-align: center;
    font-size: 14px;
    color: #cccccc;
}
.main_box_content{
    font-size: 14px;
    padding-bottom: 30px;
    padding-top: 20px;
    display: flex;
    flex-direction: row;
}
.main_box_product{
    display: flex;
    flex-direction: row;
    justify-content: center;
    align-items: center;
    padding-top: 30px;
    padding-bottom: 30px;
}
.main_box_product_item{
    width: 250px;
    text-align: center;
    font-size: 14px;
}
.item_txt{
    line-height: 28px;
}
.main_box_al_item{
    flex: 1;
    text-align: center;
    width: 400px;
}
.main_box_al_item img{
    width: 100%;
}
.main_box_about{
    line-height: 28px;
    min-height: 600px;
}
.beian{
    color: #ffffff;
}