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CSS: prevent background from scrolling

I have created a modal popup box. I want the background body to be fixed while scrolling. I googled and found to add background-attachment: fixed; but with no success.

Does background-attachment: fixed; only works for images? as stated in (w3schools.com/cssref/pr_background-attachment.asp)

/* Set background image to fixed (don't scroll along with the page)*/

background-attachment: fixed;
Solution

  • sorry, can't make the code public

    So I will just make a guess that could work.

    Add overflow: hidden; to the body of the page the moment the popup opens.