video {
    position: fixed;
    left: -650px;
    width: 3000px;
    height: 1000px;
}

.beijing {
    position: relative;
    z-index: -999;
    width: 100%;
    height: 100%;
}
@keyframes bt{
    0%{
        opacity: 1 ;
        top: 500px;
    }
    100%{
        opacity: 0;
        top: 0px;
    }
}
.wenben #bt {
    animation-name: bt;
    animation-duration: 1s;
    opacity: 0;
    position: absolute;
    top: 500px;
    left: 41%;
    color: wheat;
    text-align: center;
    font-size: 65px;
    font-weight: bold;
    transition: all 0.7s;
}
@keyframes mc{
    0%{
        opacity: 1 ;
        top: 600px;
    }
    100%{
        opacity: 0;
        top: 100px;
    }
}
.wenben #mc {
    animation-name: mc;
    animation-duration: 1s;
    opacity: 0;
    position: absolute;
    top: 600px;
    left: 47%;
    color: rgb(218, 170, 80);
    font-size: 20px;
    font-weight: bold;
    transition: all 0.7s;
}
@keyframes qb{
    0%{
        top: 0px;
    }
    100%{
        top: -750px;
    }
}
@keyframes jb{
    0%{
        opacity: 0.88;
    }
    100%{
        opacity: 0;
    }
}
#jianbian {
    animation-name: jb;
    animation-delay: 1.5s;
    animation-fill-mode: forwards;
    width: 100%;
    height: 200px;
    background-image: linear-gradient(transparent, black );
    opacity: 0.88;
    position: absolute;
    top: 555px;
}
#qb{
    position: relative;
    top: 0px;
    animation-name: qb;
    animation-fill-mode: forwards;
    animation-duration: 2s;
}
#zhenwen {
    color: wheat;
    position: relative;
    top: 200px;
    margin: auto;
    width: 500px;
    font-size: 20px;
}

#heidi {
    width: 100%;
    height: 2330px;
    background-color: black;
    opacity: 0.9;
    position: absolute;
    top: 755px;
}

.wb {
    position: absolute;
    top: 2860px;
}

#zhenwen h2 {
    color: rgb(218, 170, 80);
    position: relative;
    top: -50px;
    left: 190px;
}