Fontun font awesome olduğunu belitrmen lazım.

#af-wrapper div[id="forum-category-1109"] {
background: #ff4500 none repeat scroll 0 0;
}
#af-wrapper div[id="forum-3"] .dashicons-overview:before {
font-family: fontawesome;
content: "\f231";
}
#af-wrapper div[id="forum-2"] .dashicons-overview:before {
font-family: fontawesome;
content: "\f541";
}
#af-wrapper div[id="forum-5"] .dashicons-overview:before {
font-family: fontawesome;
content: "\f130";
}
#af-wrapper div[id="forum-6"] .dashicons-overview:before {
font-family: fontawesome;
content: "\f511";
}