#section0{
    position: relative;
    width: 100%;
    height:100vh;
    overflow: hidden;
}
#myVideo{
    position: absolute;
    right: 0;
    bottom: 0;
    top:0;
    width: 100%;
    height:100%;
    background-size: 100% 100%;
    background-color: white; /* in case the video doesn't fit the whole page*/
    background-image: /* our video */;
    background-position: center center;
    background-size: contain;
    object-fit: none; /*cover video background */
    z-index:3;
}
.kaipingbj{
    position: absolute;
    right: 0;
    bottom: 0;
    top:0;
    width: 100%;
    height: 100vh;
    z-index: 2;
    background-color: rgba(0, 0, 0, 1.0);
    overflow: hidden;
    transition:all 2s;
}
.kaipingbj.act{
    background-color: rgba(0, 0, 0, 0);
}
.kaipingbj .img{
    position: absolute;
    margin-left: auto;
    margin-right: auto;
    top: 50%;
    left: 150%;
    -ms-transform: translate3d(-50%,-50%,0);
    -webkit-transform: translate3d(-50%,-50%,0);
    -moz-transform: translate3d(-50%,-50%,0);
    transform: translate3d(-50%,-50%,0);
    transition:all 2s;
}
.kaipingbj .img img{
    width:600px;
    height: 400px;
    opacity:0.5;
    transition:all 2s;
}
.kaipingbj.act .img{
    left: -150%;
}
.kaipingbj.act .img img{
    width:1000px;
    height:1000px;
    opacity:1;
}