Change Background for One Page Only

Site URL: http://www.anti-zine.com

Hi,

Is there a way to change a background on one page only? I'd like to have text/image in the background that stays still as you're scrolling through the page.

Squarespace 7.1

Website: www.anti-zine.com

PW: chedliyang89

Have you found the code yet?

@tuanphan i also need your assistance with this! I'm trying to add this background image on just the first page. 

My site: https://mango-harmonica-5r95.squarespace.com/aboutme

The background img I'm trying to add:  

The code I tried: 

#collection-5f603ea84986ef4676be98e6
{
  #outerwrapper {
    background-image: url ("https://static1.squarespace.com/static/5f603d4e4b828967694aafaa/t/5f726ba250082d6ceeee7293/1601334178675/backgroundshape_png.png");
   background-position: center center;
   background-size: cover;
   background-attachment: fixed;
   background-repeat: repeat;
   }

Nothing shows up. I also tried to upload the background img as a svg and that didn't work. 

Add to Page Settings > Advanced > Header

If you use Personal Plan > Edit Page > Add Code Block > Paste the code

If the code doesn't work, disable Ajax Loading

<style>
  .Site, .Site-inner, main.Index, section, header.Header, footer.Footer, body {
    background-color: transparent !important;
}
  body {
    background-image: url(https://static1.squarespace.com/static/5f603d4e4b828967694aafaa/t/5f726ba250082d6ceeee7293/1601334178675/backgroundshape_png.png);
    background-color: transparent !important;
}
</style>