body {
    /* width: 1280px;*/
    padding: 0;
    margin: 0;
    font: 14px Arial,"\5FAE\8F6F\96C5\9ED1";
    background-color: #f4f4f4;
}

.banner_img, .top {
    /*height: 300px;*/
    /*width: 1280px;*/
    max-width: 1902px;
    overflow: hidden;
    margin: 0 auto;
}

.book_k {
    background-image: url('../images/bookshelf.png');
}

    .book_k img {
        margin-left: 40px;
        margin-top: 65px;
        margin-right: 40px;
    }

.bookname {
    /* margin-left: -40px; */
    background-image: url(../images/book-bg.png);
    background-size: 177px 32px;
    /* border: 2px solid #aa844b; */
    /* border-radius: 30px; */
    padding: 2px 7px 0px 7px;
    display: block;
    margin: 0px 43px -3px 40px;
    height: 30px;
    align-items: center;
    font-size: 18px;
}

.bookimgbox {
    width: 800px;
    /*margin: 0px auto;*/
    padding: 0px;
    margin-top: 30px;
}

.imgbox1 {
    width: 940px;
    /*margin: 0px auto;*/
    padding: 0px;
    margin-top: 30px;
}

.image1 {
    float: left;
    /*border: 1px solid #ccc;*/
    margin: 10px 10px;
    padding: 6px;
    display: inline;
    background-color: white;
    text-align: center;
    height: 258px;
    width: 268px;
}

.bookimage {
    float: left;
    /*border: 1px solid #ccc;*/
    margin: 4px -8px;
    /* padding: 6px;*/
    display: inline;
    /*background-color: white;*/
    text-align: center;
}

.image1 span {
    margin: 10px 2px 10px 2px;
    /* margin-top: 5px; */
    /* margin-bottom: 10px; */
    display: block;
}

.imgWidth {
    width: 100%;
    max-width: 1902px;
}

.img-shadow {
    position: fixed;
    top: 0;
    bottom: 0;
    left: 0;
    right: 0;
    background: rgba(0,0,0,.5);
    z-index: 2;
}

.img-panel {
    justify-content: center;
    align-items: center;
    display: flex;
    width: 100%;
    height: 100%;
}

.img-close {
    box-sizing: border-box;
    position: absolute;
    right: 0;
    top: 0;
    width: 50px;
    height: 50px;
    background: #606266;
    border-radius: 50%;
    z-index: 101;
    cursor: pointer;
    color: #ddd;
    text-align: center;
    line-height: 50px;
    font-size: 24px;
}

#knowledge {
    /*width: 1200px;*/
    margin: 0 auto;
}

.imgback {
    margin: 10px 10px 20px 10px;
}

.imgclick {
    cursor: pointer;
}

.title, .logo {
    cursor: pointer;
}