body{
    overflow: hidden;
    height: 98dvh;
    width: 98dvw;
    display: flex;
    align-items: center;
    justify-content: center;
}
div, video{
    height: 100%;
    animation: scaleBig 3s ease-in;
}
@keyframes scaleBig {
    from{
        transform: scale(1.0);
    }
    to{
        transform: scale(1.3);
    }    
}