.fix_header {
    background-color: #f1f2f6;
    /* position: fixed;left: 0;top: 0;width: 100%;
    z-index: 100; box-shadow: 0 0 .5rem rgba(0, 0, 0, .1); */
}
.sec_header {padding: 1.5em;}
.sec_header img {width: 20rem;}
.sec_footer {display: flex;margin-left: 1rem;}
.sec_footer .footer_btn {font-size: 2.2rem;font-weight: bold;color: #999;margin: 1rem;margin-bottom: .5rem; padding-bottom: .3rem;}
.sec_footer .footer_btn.on {border-bottom: 2px solid #111;color: #111;}

.bannerImg {
    width: 100%;
    padding: 1.5rem 0;
}
.bannerImg a {
    width: 100%;
}
.bannerImg a img {
    width: 100%;
}