Adding a background colour to one markdown, instead of all of them

Hello

I'm currently using CSS to make the background of a markdown blue, however I don't want to apply this to all the markdowns on the website, just certain ones.

I'm using the below but it affects all boxes:

Quote

.markdown-block {
    background: #bfd6ea;
}

I need to target a specific one on the page with a block id, is there a way to do this?

You can replace .markdown-block with block id

Use this tool to find id

https://chrome.google.com/webstore/detail/squarespace-id-finder/igjamfnifnkmecjidfbdipieoaeghcff