Change background on mobile for one page only

Hi! Trying to change the background on the mobile version of the site for section 1 only to a different image better suited for mobile. 

I used the following in the CSS code, and it worked, but for every page on the site whereas I only need it on the home page. 

When I added it to the page header code injection for the specific page it did make any changes at all. 

@media only screen and (max-width: 640px)

{

#page .page-section:nth-child(1) .section-background img {opacity:0 }

#page .page-section:nth-child(1) .section-background {

background-image: url(https://static1.squarespace.com/static/636ac17575f6c9285d9ce537/t/636c3313efe57d0fa530edba/1668035358549/mobilev2.png);

background-size: cover;

background-position: center;

background-repeat: no-repeat;

}

}

18 hours ago, tsphillips said:

Hi! Trying to change the background on the mobile version of the site for section 1 only to a different image better suited for mobile. 

 

I used the following in the CSS code, and it worked, but for every page on the site whereas I only need it on the home page. 

 

When I added it to the page header code injection for the specific page it did make any changes at all. 

 

@media only screen and (max-width: 640px)

{

#page .page-section:nth-child(1) .section-background img {opacity:0 }

#page .page-section:nth-child(1) .section-background {

background-image: url(https://static1.squarespace.com/static/636ac17575f6c9285d9ce537/t/636c3313efe57d0fa530edba/1668035358549/mobilev2.png);

background-size: cover;

background-position: center;

background-repeat: no-repeat;

}

}

Can you share your site with protected password so I can take a look?

I found the answer! 

it's 

#collection-(Your specific site ID)

{ (The code you want on this one specific page) }

Shout out to this page for the answer! 

https://sf.digital/squarespace-solutions/how-to-apply-css-to-specific-pages-in-squarespace