I actually like it. No distractions, easy to read. It was so good that when I read your comment I didn't even remember what was the format I was reading! I had to click again and re-check. I did remember it was black text on white background.
More that on my screen it's around 320 pixels or so wide... 1/8 of my screen resolution... I would expect at least double of that for reasonable reading experience...
What surprised me: I didn't see any date on that blogpost. So I had to search the name of the author in Google News to discover that he indeed resigned today, and not a few days/weeks ago.