[Feature Request] Custom colors or themes

[rmackinnon]

First off have to say I love the app. Saves a ton of time not having to export via Sublime Text, when I just need to live edit or update something. That said, I've noticed that the hyperlink color (which is probably a system color in GNOME on my system) is incredible hard to read on a dark background. It appears to be something close to #0000FF.

Is this feasible?