Text (title) coming out poor quality

Hello, I've recently started using DaVinci Resolve, and in my current project I'm trying to put some text over a clip from a game (League of Legends). My problem is that in both the preview and the rendered video the text comes out low res and not very good quality. (I've attached a screenshot)

I haven't been able to find a way around this, so if there's something I'm missing I'd appreciate any help.
Thanks.

Screenshot of the poor quality text

Screenshot (12).png (719.95 KiB) Viewed 322 times