*{
    margin:0;
    padding:0;
    box-sizing: border-box;
}
#vidpar{
    position:relative;
    width:100%;
    height:150vh;
    overflow:hidden;
    background-color:rgba(0, 0, 0, 0.5);
    background-blend-mode: overlay;
}
#starvid{
    position: absolute;
    top:0;
    left:0;
    width:100%;
    height:100%;
    object-fit: cover;
    pointer-events: none;
    z-index: -1;
}

.calcu{
    width:70px;
    height:70px; 
}
#nav{
    background-image:url("Image/z.jpg");
}