Tiddly Editor Custom Font

[h0p3]

I use a stylesheet with a font embedded in it that looks something like this:

@font-face { font-family:'customfont'; src: url('data:application/octet-stream;charset=utf-8;base64 ...

This is the font I want inside and out in the wiki. I don't want any other font. In the Settings of Theme Tweaks of Appearance of ControlPanel, I've set 'Font Family', 'Code font family', and 'Editor font family' all to this custom font. This works, except for the actual tiddler editor font (and its Title when being edited). The font for the editor can be changed, but so far, I can't get it to use my custom font. I'm sure I must be missing something obvious. At the very least, I need a mono-spaced font, so I just have 'mono' set in 'Editor font family'. This still isn't my preference. 

Please help me. I don't know if I've given you enough information, but I don't know what other information would be useful to give (I don't know what I don't know).