Banner Overlay on One Page

Hey everyone! I just watched a video on adding a specific banner overlay on one image but it wasn't working. (I think I did something wrong with the section ID)

I wanted to add a banner overlay on this page and this page only using custom CSS

https://www.jfkjets.com/aerial-photography

Thank you! 

body#collection-5e1c0f9d3796b2442328e8f8 .Index-page-image:before {
    content: "";
    top: 0;
    left: 0;
    z-index: 1;
    width: 100%;
    height: 100%;
    background-color: rgba(0,0,0,0.4);
}