CSS (new user)

New to bbPress and I’ve looked everywhere for how to change the colors to match my site design better. I thought I had found the correct CSS to change the background color and added it to my custom CSS for the Avada theme –

#bbpress-forums {
background-color:#0d4d00 !important;
}

but it did nothing. Appreciate if someone could steer me in the right direction. Thanks.