On a panel I would like just the title to be in bold. Selecting the panel and then selecting bold in the ribbon (Format text > Font > Bold) applies to the whole panel - e.g. including all controls inside the panel.

So I tried applying custom CSS. Knowing little CSS the only thing I can come up with is to set the CSS class of all controls inside the panel to "custom-font" and to then add the following to Form settings > Custom CSS: 

.custom-font {
font-weight: normal;
}

I would rather just apply a direct custom font to all panel titles!

Any ideas?