#mainbody3 {
    display: none;
    z-index: 10;
    position: fixed;
    top: calc(15vw/19.20);
    left: calc(0vw/19.20);
    width: calc(1425vw/19.20);
    height: calc(985vw/19.20);
}
#videocontainer3 {
    position: fixed;
    left: calc(0vw/19.20);
    top: calc(150vh/10.80);
}
#myCanvas3 {
    background-color: #ffffff;
}