body {
    width: 100%;
    height: 100%;
    margin: 0 auto;
    background-color: #ffffff;
}

.background {
    width: 100%;
    height: auto;
    min-width: 1200px;
    background-color: #ffffff;
}

/*banner*/
.banner {
    width: 100%;
    height: 400px;
    min-width: 1200px;
    margin-right: auto;
    margin-left: auto;
    background-image: url(banner.jpg);
    background-repeat: no-repeat;
    background-position: top;
    background-size: 100% 100%;
}

/*主体*/
.main {
    width: 100%;
    height: auto;
    min-width: 1200px;
    background-color: #ffffff;
    margin-top: 50px;
}

/* tab栏目 */
.div_content_tab {
    width: 100%;
    min-width: 1200px;
    height: auto;
    text-align: left;
    margin: 0px auto 70px auto;
}

/* 子栏目 */
.div_content_col {
    width: 100%;
    min-width: 1200px;
    height: auto;
    text-align: left;
    margin: 0px auto 0px auto;
}

/* 左右分块 */
.div_part {
    width: 700px;
    min-height: 397px;
    margin: 0px 0px auto 0px;
    float: left;
    position: relative;
}

    .div_part_img {        
        width: 100%;
        height: 100%;
        position: absolute;
        top: 0;
        left: 0;
        z-index: 1;
    }
    .div_part_img_over {
        width: 148px;
        height: 148px;
        background-image: url(play.png);
        position: absolute;
        top: 125px;
        left: 276px;
        z-index: 2;
        border: 0;
    }

/* 视频介绍 */
.div_xw_list {
    text-align: left;
    float: left;
}
/* 单行标题 */
.div_xw_title {
    width: 460px;
    height: auto;
    background-repeat: no-repeat;
    margin-bottom: 30px;
    margin-top: 0px;
}

.div_xw_title p {
    width: 100%;
    min-height: 30px;
    text-align: left;
    font-family: 'Microsoft YaHei';
    font-size: 40px;
    font-weight: bold;
    text-align: justify;
    line-height: 50px;
    color: #141c25;
}

/* 多行简介 */
.p_xw_abstract {
    width: 460px;
    min-height: 200px;
    max-height: 360px;
    float: left;
    font-family: 'Microsoft YaHei';
    font-size: 16px;
    text-align: justify;
    line-height: 30px;
    color: #141c25;
    overflow: hidden;
}

/*视频*/
.div_video {
    width: 1205px;
    height: auto;
    text-align: left;
    margin: 50px auto 0px auto;
}

.div_video ul {
    width: 1251px;
    margin: 0px;
    padding: 0px;
}

.div_video ul li {
    width: 366px;
    min-height: 270px;
    margin: 0px 51px 30px 0px;
    float: left;
    list-style: none;
}

/*视频图片*/
.div_video_img{
    width: 366px;
    height: 227px;
    background-repeat: no-repeat;
    background-size: 100% 100%;
}
    .div_video_img img{
        width: 366px;
        height: 227px;
        background-image: url(play.png);
    }
    .div_video_img div{
        width: 366px;
        height: 40px;
        background-size: 100% 100%;
    }

.div_video_text {
    width: 366px;
    height: 60px;
}

/* 多行名称 */
.p_title {
    width: 100%;
    height: auto;
    margin-top: 10px;
    font-family: 'Microsoft YaHei';
    font-size: 16px;
    line-height: 26px;
    text-align: left;
    color: #141c25;
}

/*移动视频*/
.div_video_m {
    width: 1200px;
    height: auto;
    text-align: left;
    margin: 0px auto 0px auto;
}

.div_video_m ul {
    width: 1240px;
    margin: 0px;
    padding: 0px;
}

.div_video_m ul li {
    width: 270px;
    height: 479px;
    margin: 0px 40px 30px 0px;
    float: left;
    list-style: none;
}
/*移动视频图片*/
.div_video_m_img {
    width: 270px;
    height: 479px;
    background-repeat: no-repeat;
    background-size: 100% 100%;
}

    .div_video_m_img div {
        width: 270px;
        height: 479px;
        background-size: 100% 100%;
    }