Individual Colors for Collage Image Blocks

Site URL: https://www.ayudaroc.org/services/

Good afternoon!

I am trying to create an eye-catching Services page for my website, and I am using the Collage Image block. At present, each of the six service descriptions I've written all have the same bland grey background. I would like to be able to inject custom-css / potentially use code blocks to be able to make each of the grey boxes a different color matching my branding palette. Would someone be able to give me some assistance in doing this?

Thanks so much,
William,
Founder, Ayuda Foundation

Each block has different ID. Replace ID to change color for each block.

Add to Home > Design > Custom CSS

div#block-ca2da190b05a1f92a8ce .image-card {
    background: green;
}

Find block ID. https://chrome.google.com/webstore/detail/squarespace-collectionblo/bggpdfnccodbnmcndckmeehdjkjojkde

This was extremely helpful. I wouldn't have figured out the image card without. Kept trying to isolate things in collage.