About changing container BG color at specific route

[L3010]

I'm looking for a way to change the main container BG color at a specific route. To be more speciffic, at different categories, i want different container background colors.

I know how to code a route check if statement:

{if $[route.name] == "home"} {/if}

But i do not know how to target certain CSS-colors, I'm looking for a way to change the colors listed in "ADMIN > Advanced Styles And CSS".

I'm unsure of how to code is a line similar to:

document.getElementById(myId).style.background-color = "#3010ff";

    // Changes background-color of id

If anyone could explain this to me i would be thankfull