html {
    height: 100%;
}

body {
    min-height: 100%;
    position: relative;
}

/* banner */
.banner {
    width: 100%;
    background: #588bff;
    display: flex;
    justify-content: center;
}

.banner .banner-img {
    margin-top: 45px;
}

.banner .banner-img img {
    width: 745px;
    height: 670px;
}

img {
    width: 100%;
}