First try this class on your template grid:
templategrid-stylingless
If that doesn’t do quite what you need, you can customize your UI with CSS. I’d recommend setting up Calypso as described here to easily edit the Mendix Atlas styling files: https://docs.mendix.com/howto/front-end/calypso
Would I put that class under the “Common” section of the Properties?
I should have mentioned I have an embedded table widget within my template grid … I tried applying the same classes to the table widget, but the output still appears like this … Sounds like I might have to use Calypso?