body {
    width: 100%;
    height: 100%;
    margin: 0;
    position: fixed;
    background-color:#000000;
}

#video { 
    width: 100%; 
    height: 100%; 
    display:none;
}


#button{
    position:absolute;
    z-index:10;
    width:42vh;
    height:42vh;
    top:29vh;
    left:calc(50vw - 21vh);
    cursor:pointer;
    border-radius:1000px;
}