Adding custom fixed background image to one page

Site URL: http://www.bestnursegear.com/best-christmas-gifts-for-nurses

I am trying to add a fixed background to this page and am struggling to find the right code. I found a few answers on the forum but they didn't work when I did Custom CSS and added the code to my site. I'd also like to be able to change the transparency of the image after I add it. Thanks!

[data-section-id="5f60cc068db5a561fc5bac98"] .section-background {
    background-image: url(' ** LOCATION OF IMAGE ** ');
    background-size: cover;
    background-attachment: fixed;
}

You will need to add the url of the image. Also, I am not sure what you mean about changing the transparency.

18 minutes ago, rwp said:

[data-section-id="5f60cc068db5a561fc5bac98"] .section-background {
    background-image: url(' ** LOCATION OF IMAGE ** ');
    background-size: cover;
    background-attachment: fixed;
}

You will need to add the url of the image. Also, I am not sure what you mean about changing the transparency.

I tried injecting this (after adding in the link to my image) and it doesn't change anything. For clarification, I'm going to "Design" then "Custom CSS" and pasting it there. Am I doing something wrong?

You need to add the URL of your image, you added a link to a pexels page.