I have below css class, when I add it to my scss file, it works fine but if I add it to index.html its broken when I run ng serve. .header-pattern { background: url("data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAB4AAAAQ4CAYAAADo08FDAAHMi0lEQVR42uz920ucebr4f/vr6c7GTe0sk4f5...