Social Icons Background Image

Hi,
I have a repeating BG image throughout the content of the site, easily added in through the general styling for each section. However, the social icons area is just showing the set BG color. Is there any way to add a BG image to the social Icon area? I’ve tried adding the following in the Custom CSS of the logo area section, but it doesn’t show anything:
#top .social_bookmarks
{
background-image: url(http://8xt.d3a.myftpupload.com/wp-content/uploads/2018/10/content_bg_repeat.jpg);
}