body{
    margin: 0;
    padding: 0;
    overflow: hidden;
}
#videoContainer{
    position: fixed;
    top: 0;
    left: 0;
    height: 100vh;
    height: calc(var(--vh, 1vh) * 100);
    width: 100vw;
    z-index: 99999;
    overflow: hidden;
    display: flex;
    flex-direction: column;
    justify-content: center;
}
video , #main-video, #mainVideo{
    height: 100%  !important;
    width: 100%  !important;
    padding: 0 !important;
}
.firstC{
    position: absolute;
}