Is it possible to add dividers/ horizontal lines between items in a summary block?

I have a summary block in my page but feel like the titles are visually hard to tell apart at first glance. I'd like to be able to put a horizontal line as a divider in between each title of the summary block if possible.

Hello,

In order to best help you or provide an accurate code, please share the URL to your public website or if your site isn't live yet, enable a password under your websites visibility menu and share both.

Thanks,

-Dan