.parallax div {
    background-attachment: fixed;
    height: 50vh;
    text-indent: -9999px;
    background-position: center center;
    background-size: cover;
    &:nth-child( 2n )

{
    box-shadow: inset 0 0 1em #111;
}

}


.foo_a {
    background-image: url(https://s3-us-west-2.amazonaws.com/s.cdpn.io/30354/parallax1.jpg);
}

.foo_b {
    background-image: url('../Images/Pictona-Drone-east-1024x576.jpg');
    /*<iframe width="1280" height="720" src="https://www.youtube.com/embed/lTHLPLiqB38" title="YouTube video player" frameborder="0" allow="accelerometer; autoplay; clipboard-write; encrypted-media; gyroscope; picture-in-picture" allowfullscreen > </iframe >*/
    /*../Images/Pictona-Drone-east-1024x576.jpg'*/
}

.foo_c {
    background-image: url(https://s3-us-west-2.amazonaws.com/s.cdpn.io/30354/parallax3.jpg);
}

.foo_d {
    background-image: url(https://s3-us-west-2.amazonaws.com/s.cdpn.io/30354/parallax1.jpg);
}

.foo_a2 {
    background-image: url(https://s3-us-west-2.amazonaws.com/s.cdpn.io/30354/parallax1.jpg);
}

.foo_b2 {
    background-image: url(https://s3-us-west-2.amazonaws.com/s.cdpn.io/30354/parallax2.jpg);
}

.foo_c2 {
    background-image: url(https://s3-us-west-2.amazonaws.com/s.cdpn.io/30354/parallax3.jpg);
}

.foo_d2 {
    background-image: url(https://s3-us-west-2.amazonaws.com/s.cdpn.io/30354/parallax1.jpg);
}