Selected Quote Background Color

[Canapin (Coin-coin le Canapin)]

Hello,

You can easily find out using this guide:

Make CSS changes on Your Site

Want to make some CSS changes on your Discourse site but not sure where to start? You’ve come to the right place! You only need to read this topic if you’re very new to CSS. If you already know how to write and add CSS to your Discourse site, then you will most likely not need to read this topic. We’ll cover a few subjects. We’ll start with a brief introduction of what CSS is and some terms that you need to know. We will then move on to how you can add CSS to your Discourse site. Final…

It will help you in the future.

For what you ask, the code to change this specific part would be this one. Replace the default value with whatever color you’d like.

.cooked span.highlighted {
    background-color: var(--tertiary-low);
}

I added the .cooked selector because I believe span.highlighted is used in other parts of the forum.