header {
    text-align: center;
    padding: 1.5rem 0;
    border-bottom: 1px solid #e8e8e8;
    position: relative;
    font-size: 1.8rem;
    font-weight: 600;
}

header .home_btn {
    position: absolute;
    left: 1.5rem;
    top: 50%;
    transform: translateY(-50%);
}
header .home_btn img { transform: rotate(180deg);}

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