header{
    margin: auto auto 20px auto;
    height: 400px;
    width: 1300px;
    background:  #d2f8fd;
    text-align: center;
}
header>img{
    width: 80%;
    height: 100%;
}
/*main*/
main{
    width: 1300px;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    background:  #d2f8fd;
    margin: 0 auto;
    padding: 30px 0;
}
main>.maintop{
    width: 80%;
    height: 800px;
    background-image: url(../images/bjtp.jpg);
    background-size: 100% 100%;
    margin-bottom: 80px;
}
main>.maintop>div{
    height: 100%;
    background: rgba(255,255,255,0.1);
    display: flex;
    flex-direction: column;
    justify-content:space-around ;
}
main>.maintop>div>h2{
    width: 80%;
    line-height: 40px;
    margin: 0 auto;
    cursor: default;
    color: white;
}
main>.maintop>div>p{
    width: 75%;
    margin: 0 auto;
    font-size: 18px;
    cursor: default;
    color: white;
    font-weight: bolder;
    font-family: "楷体";
}
/*mainbottom*/
main>.mainbottom{
    width: 80%;
    /*height: 400px;*/
    display: flex;
    background: white;
}
main>.mainbottom>.video{
    height: 200px;
    width: 300px;
}
main>.mainbottom>.video>video{
    width: 95%;
    margin: 30px 10px;
}
main>.mainbottom>.rdiv{
    flex: 1;
    /*height: 400px;*/
    border-left: 2px solid grey;
}
main>.mainbottom>.rdiv>h2{
    width: 90%;
    line-height: 60px;
    margin: 0 auto;
    cursor: default;
    color: #019cb0;
    text-shadow: -1px -1px white,1px 1px black;
}
main>.mainbottom>.rdiv>p{
    width: 85%;
    margin: 15px auto;
    cursor: default;
    font-family: "楷体";
    font-size: 1.1em;
    /* letter-spacing: 0.2em; */
}
main>.mainbottom>.rdiv>p>span{
    text-decoration: underline;
}
/* 返回顶部 */
.main_box{
    width: 40px;
    position: fixed;
    right: 0;
    bottom: 30%;
    background-color: #ffffff;
    border-radius: 5px;
    padding: 5px 0 5px 5px;
}
div.main_box>p{
    font-weight: bold;
    color: #000000;
}
div.main_box a{
    text-decoration: none;
}