One long image as background for sections

Hi, I want to use one long image as a background for multiple sections on my website. I don't want to reuse the image for each section, it has to continue, despite it being overlayed with different sections. How do I do this? When I add it to my design, I have to select the part I want to display, but don't see how to use the entire image.

Hi. What is site url? you need to use custom code to do this

I have now added parts of the large image in different sections, but want the entire image to span across all sections. The url is: https://www.zertifai.com/

@tuanphan Could you let me know where I can find custom code to do this?

I had this code working and now all of a sudden it doesn't anymore. I've got two of these, one for the body one for the header, maybe the yre in conflict?

/*Hintergrund Papier*/
/* Site background image */
.section-background, .page-section {
    background: transparent !important;
}
body {
   background-image:url('https://static1.squarespace.com/static/6366aa91142406517bac679a/t/6367723f3491af7341a16534/1667723840909/papier.jpg');
   background-size: cover;
   background-repeat: no-repeat;
   background-position: center center;
   background-color: transparent !important;
}
/*Ende Hintergrund Papier*/
/*Hintergrund Papier für Titelbanner*/
.header {
background-image:url('https://static1.squarespace.com/static/6366aa91142406517bac679a/t/6367723f3491af7341a16534/1667723840909/papier.jpg');
background-repeat:no-repeat;
background-size:cover;
background-position: center;
}

2 hours ago, Stefan G said:

I had this code working and now all of a sudden it doesn't anymore.

The downside of custom code. SS made changes to the structure of backgrounds recently.

Please post the URL for a page on your site where we can see your issue.

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Post the password here.

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We can then take a look at your issue.