Changing Background Colours on Ishimoto Template

As it says in the title, I'm using the Ishimoto template and I want to each page to have a different background colour. At the moment my splash page is one colour and every other page is another colour and it's really limiting. Does anyone have any recommendations CSS-wise?

@Checklistrobot Each page will have different ID. See how to find Page ID: https://beaverhero.com/squarespace-how-to/#HowtoFindPageIDThen use CSS

body#collection-56c4fcb937013b1e927742bb {
   background: red;
}

It worked! Totally easy along with that guide on Page ID's. Thank you so much for your help!