It’s not clear what you have tried already, so it is impossible to offer any suggestion. E.g. is:
.missing_labels {
font-weight: bold !important;
padding-bottom: 0 !important;
}
something you want or something you have already tried? If the latter, how did you try? It is always advised to provide a complete minimal reproducer. Real, actual, runnable code focuses the discussion in a way that nothing else can, and is the absolute best way to help others help you.