In order to keep `index.html` a little more manageable, I recommend defining this SVG as an independent file in our `styles/` directory. You'll need to either set it as the CSS `background-image` of the `#analog-clock-container` element.

I like your idea to define an `#analog-clock-face` element, though, and the `-container` element has no semantic value whatsoever. It might result in a bigger patch, but I think this is a good opportunity to rename `#analog-clock-container` as `#analog-clock-face`. What do you say?