javascript - Scrolling background image with boundaries -

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I have a big background image. I would like to do this when I scroll down the page, also the image scroll down. ..but when it is under the image it does not continue to scroll to white space. How do I do this?

In addition to this, I would like to scroll through it easily.

something like that?

You should play with background-attachment and background-size: 

  background-shaped: cover; Background-attachment: fixed;

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