.wrap{
    height: 100vh;
    width: 100%;
    position: relative;
    background: none;
    background: url('../images/index/banner_back.png');
    background-size: 100% 100%;
}
.wrap  .video{
/* width: 100%;
height: 100vh; */
position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    /* height: 100%; */
    z-index: -1;
}

.wrap .main .content{
    width: 87%;
    align-self: center;
    display: flex;
    flex-direction: column;
    /* justify-content: flex-end; */
    flex-grow: 1;
}

.wrap .main .content .banner_desc{
    align-self: center;
    display: block;
    margin-top: 300px;
    width: 1080px;
    height: 119px;
}
.wrap .main .content .download_btn{
    align-self: center;
    display: block;
    margin-top: 100px;
    width: 282px;
    height: 70px;
    /* background: url('../images/index/download_btn.png'); */
    background-size: 100%;
}