This is the mnmotebook theme, (heavily) adapted from Mathieu Agopian's mnmlist for Pelican, adapted in turn from the mnmlist theme for wordpress, each of which has been released into the public domain.
The adapted mnmotebook theme is copyright 2015 Daniel MacKinlay, and released under the GPL licence.
There's two additional settings used by this theme, if present:
HIDE_DATE = False
If HIDE_DATE is set to True, dates won't be displayed under the blog post titles.
There's also a footer slogan:
SLOGAN = "My site rulez"
The main.css file is generated from the compass/src/main.scss sass file, using http://compass-style.org/
From the command line:
compass compile
or maybe try scout, or use libsass/sassc
sassc -l compass/src/main.scss static/css/main.css
This theme sorts by "modified" date; if not all your articles have "modifed" dates, you might want to use the always_modified plugin.