Suggestions; the regex reference could use a distinguishing feature such as a subtle light grey background and/or a line seperating it along with more whitespace.
Also, the boxes seem arbitrarily placed. I realize one is centered, and the others take up the remaining space on the next "line", but perhaps you could create better visual boundaries or something.
Lastly, apologies, but maybe the font Lato looks nice on your setup, but its rather jaggedy/unappealing on windows.
The regex reference is only temporarily there. It'll eventually be replaced by a much better feature which is in the pipeline. I'll play around with the css to make it better.
I've played around with the positioning a bit, and it definitely needs iteration. However, an upcoming ui change will drastically change the demands on the ui, so it doesn't make sense to optimize that yet.
I'll replace the Lato font. I agree it looks terrible on windows.
