/*commom style*/

*,
*:before,
*:after {
    box-sizing: border-box;
    -webkit-box-sizing: border-box;
    -moz-box-sizing: border-box;
}

body,
h1,
h2,
h3,
h4,
h5,
h6,
hr,
p,
blockquote,
dl,
dt,
dd,
ul,
ol,
li,
pre,
form,
fieldset,
legend,
button,
input,
textarea,
th,
td,
img {
    border: medium none;
    margin: 0;
    padding: 0;
}

em {
    font-style: normal;
}

ul,
ol {
    list-style: none;
}

table {
    border-collapse: collapse;
    border-spacing: 0;
}

a,
ins {
    text-decoration: none;
}

*:focus {
    outline: none;
}

a {
    color: #636363;
}

a:hover {
    color: #355e92;
}

.fl {
    float: left;
}

.fr {
    float: right;
}

.cf:after {
    display: block;
    content: "";
    height: 0;
    visibility: hidden;
    clear: both;
}

.cf {
    zoom: 1;
}

.hide {
    display: none;
}

.block {
    display: block;
}

body {
    font-family: "微软雅黑";
    font-size: 13px;
    color: #1f1f1f;
    background: url("../images/big-bg.png") center top no-repeat
}

.wd1200 {
    width: 1200px;
    margin: 0 auto;
}

.bt_content {
    margin: 560px auto 80px auto;
    height: 640px;
}

.book {
    width: 1000px;
    height: 640px;
    background-color: #beb395;
    margin: 0 auto;
    padding: 20px;
}

.bt_content .wd1200 {
    position: relative;
}

.prev {
    display: block;
    width: 96px;
    height: 96px;
    position: absolute;
    background: url("../images/left2.png") no-repeat;
    top: 50%;
    margin-top: -48px;
    left: 0;
}

.next {
    display: block;
    width: 96px;
    height: 96px;
    position: absolute;
    background: url("../images/right2.png") no-repeat;
    top: 50%;
    margin-top: -48px;
    right: 0;
}

.book a {
    position: absolute;
    display: block;
    width: 960px;
    height: 600px;
}

.book a img {
    width: 960px;
    height: 600px;
}