.header {
    position: fixed;
    width: 100%;
    height: 100px;
    z-index: 999;
    top: 0;
    left: 0px;
    background: #fff;
    opacity: 1;
    transition: all 200ms linear;
    box-shadow: 0px 0px 3px rgba(99, 99, 99, 0.2);
}



.logo_img img {
    width: 100%;
    height: auto;
}

.scroll_header {
    height: 80px;
}

.scroll_header .logo_img {
    width: 180px;
    height: 58px;
}

.nav_item {
    line-height: 50px;
    margin: 0 20px;
    position: relative;

}

.nav_item a {
    display: block;
    width: 100%;
    height: 100%;
}



.nav_item:hover>a {
    color: #005baa;
}

.active>a {
    color: #005baa;
}



.about_nav li :hover {
    color: #005baa;

}

.footer {
    width: 100%;
    height: auto;
    background-color: #f9f9f9;
}

.footer_title {
    padding-bottom: 30px;
}

.footer_icon {
    width: 100%;
    border-bottom: 1px solid #928181;
    display: flex;
    align-items: center;
    flex-wrap: wrap;
}

.footer_icon img {
    width: 30px;
    height: 30px;
    margin-right: 20px;
}

.footer_email {
    width: 100%;
    padding: 20px 0;
}

.footer_email a {
    color: #005baa;
    margin-left: 10px;
}

.copyright_box {
    font-size: 18px;
    line-height: 24px;
    padding: 10px 0;
}

@media screen and (min-width: 870px) {
    .header_container {
        max-width: 1200px;
        height: 100%;
        margin: 0 auto;
        display: flex;
        justify-content: space-between;
        flex-wrap: wrap;
        align-items: center;
    }

    .logo_img {
        display: block;
        width: 226px;
        height: 73px;
        transition: all 200ms linear;

    }

    .header_btn {
        display: none;
    }

    .nav {
        display: block;
        display: flex;
        height: 50px;
    }

    .about_nav {
        display: none;
        top: 50px;
        left: 50%;
        transform: translateX(-50%);
        position: absolute;
        background-color: #fff;
        box-shadow: 1px 1px 4px 0px rgba(0, 0, 0, 0.2);
    }

    .about_nav li {
        display: block;
        width: 130px;
        text-align: center;
    }

    .about_nav li:first-child {
        border-bottom: 1px solid #D3CDCE;
    }

    .about:hover .about_nav {
        display: block;
    }
}

@media screen and (max-width: 870px) {


    .header_container {
        max-width: 1200px;
        height: 100%;
        margin: 0 auto;
        display: flex;
        justify-content: space-between;
        flex-wrap: wrap;
        align-items: center;
        position: relative;
    }

    .logo_img {
        display: block;
        width: 226px;
        height: 73px;
        transition: all 200ms linear;
        margin-left: 20px;
    }

    .header_btn {
        display: block;
        margin-right: 20px;
    }



    .header_btn img {
        width: 40px;
        height: 40px;
        cursor: pointer;
        transition: all 200ms linear;

    }

    .close_img {
        display: none;
    }

    .scroll_header .header_btn img {
        width: 35px;
        height: 35px;
    }

    .nav {
        display: block;
        position: absolute;
        width: 100%;
        height: 0px;
        left: 0;
        top: 100px;
        background-color: #fff;
        overflow: hidden;
        transition: all 200ms linear;
        box-shadow: 0px 0px 3px rgba(99, 99, 99, 0.2);
    }

    .scroll_header .nav {
        top: 80px;
    }

    .about_nav {
        display: block;
    }

    .about_nav li {
        display: block;
        width: 100%;
        padding-left: 20px;
    }
}