.banner{
    margin-top: 100px;
    background-image: url(../images/banner/banner_pc.png);
    background-repeat: no-repeat;
    width: 100%;
    height: 650px;
    background-size: auto 100%;
    background-position: top;
}
@media screen and (max-width: 1280px) {
    .banner{
        height: 500px;
    }
}
@media screen and (max-width: 750px) {
    .banner {
        margin-top: 0.88rem;
        height: 3.75rem;
        background-image: url(../images/banner/banner_m.png);
    }
}