The site is using pale text on a default background, so it looks fine with my white-on-black GTK theme, but I imagine is unreadable for most of the world.
Many sites make the mistake of mixing default and non-default colours, but this is the first time I've seen it work in my favour ;) Presumably most devs aren't doing any kind of contrast analysis on their CSS, and are only testing with a black-on-white colour scheme.
I love that the ACM provides HTML versions of articles from the Queue, but the figures and tables are not well integrated with the text in the HTML versions.
[0] http://cacm.acm.org/magazines/2015/11/193326-inductive-progr...