Hello Becky
Can you add the following code to your child theme, or in Appearance » Customize » Additional CSS?
#tribe-events-bar * {color: white !important;}
#tribe_events_filters_wrapper.tribe-events-filters-horizontal .tribe-events-filters-group-heading {font-size: 1.3rem; margin-top: -4px !important;}
The differences can be part of your theme’s settings. This code should help clear some of that up.
http://wpshindig.com/events/photo/ is an example of how this layout can be expected to appear. Where would you like the borders to appear?
Let me know if the provided code helps.
Thanks
Courtney 🙂