helvetic | reverse engineering the Fitbit Aria

I think this might be due to cairo rendering. In order to set the font size, Gnuplot calls function pango_font_description_set_size with the supplied size, i.e., 12 in your case. However, this is then translated into the cairo units:

the size of the font in points, scaled by PANGO_SCALE. (That is, a size value of 10 * PANGO_SCALE is a 10 point font. The conversion factor between points and device units depends on system configuration and the output device. For screen display, a logical DPI of 96 is common, in which case a 10 point font corresponds to a 10 * (96 / 72) = 13.3 pixel font.

Moreveor, from the documentation of the function pango_cairo_font_map_set_resolution:

Have a look at BeautifulSoup. This is an html parser, that will make it easy to find precise tags. Instantiate a BeautifulSoup object with your html code as argument. Then use its find_all method to find the hyperlink tags ( becomes "a").

You're missing the opening { and closing }); after $(document).ready(function()

This will also only show the sidebar. If you want the sidebar to open/close, change $("#sidebar").addClass("visible"); to $("#sidebar").toggleClass("visible");