body {
    background-color: black;
    font-family: "Microsoft YaHei";
}


* {
    margin: 0;
    padding: 0;
}

.banner {
    position: relative;
    height: 100vh;
    
    /*进行视频裁剪*/
    overflow: hidden;
    display: block;
    z-index: 1;
    background-image: url("https://itsz1shu.github.io/img/bgimg.png");
    background-size: cover;
    background-blend-mode: multiply;
    background-color: rgba(0, 0, 0, 0.342);
}

.banner .vidbg {
    position: absolute;
    left: 50%;
    top: 50%;
    /*保证视频内容始终居中*/
    transform: translate(-50%, -50%);
    width: 100%;
    height: 100%;
    /*保证视频充满屏幕*/
    object-fit: cover;
    min-height: 800px;
    z-index: -1;
    display:block;
    background-blend-mode: multiply;
    background-color: rgba(0, 0, 0, 0.342);
    
}

.banner h1{
    z-index: 100;
    color: white;
    font-weight: 10000;
    margin-top: 200px;
}

.slogan {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    width: 684px;
    color: white;
    text-align: center;
    z-index: 10;
}
.slogan .title {
    font-weight: 550;
    font-size: 56px;
    margin: 0 0 16px;
    letter-spacing: 10px;
}

.slogan .subtitle {
    font-weight: 550;
    font-size: 20px;
    letter-spacing: 10px;
    margin: 0 0 16px;
}

footer{
    background-color: white;
    border-top: 5px double rgb(181, 181, 181);
    padding-top: 50px;
    width: 100%;
    align-content: center;

}

.footer-logo{
    width: 100%;
    margin: auto;
}

.footer-logo img{
    height: 100px;
    display: flex;
    margin: auto;
    margin-bottom: 50px;
}

.footer-img-link{

}

.footer-nav{
    align-content: center;
    height: 100px;
    display: flex;
    margin: auto;
    justify-content: space-between;
    margin-left: 30%;
    margin-right: 30%;
}

.footer-nav a{
    margin: 20px;
    font-size: 20px;
    font-family: "STSong";
    letter-spacing: 10px;
    font-weight: normal;
    line-height: 24px;
    color: black;
}

.footer-nav a:hover{
    margin: 20px;
    font-size: 20px;
    font-family: "STSong";
    letter-spacing: 10px;
    font-weight: normal;
    line-height: 24px;
    color: black;
    text-decoration: underline;
}

.copyright{
    margin: 20px;
    font-size: 12px;
    font-family: "STSong";
    letter-spacing: 10px;
    font-weight: normal;
    line-height: 24px;
    color: black;
    align-content: center;
    display: block;
    margin-bottom: 5px;
    text-align: center;
    
}