How come my font isn't working?

Burktross

I'm running 2.0.11 and making a story with Harlowe, and in my stylesheet I have.

---

body {
background-color: black;
}

tw-passage {
color: green;
font-family: "Fallout";
}

tw-link {
color: green;
font-family: "Fallout";
}

---

But the font won't load.

Fallout.tts is installed on my system, reachable here.
http://static.tumblr.com/mdtvpdz/ruvmxzc8u/fallout.ttf

Even hooking it in the story with

---

(font: "Fallout")[
Test 123]

---

Does not work.

Any help?