/usr/share/docutils/writers/s5_html/themes/default/ is in docutils-common 0.12+dfsg-1.
This file is owned by root:root, with mode 0o755.
..
/usr/share/docutils/writers/s5_html/themes/default/blank.gif
/usr/share/docutils/writers/s5_html/themes/default/framing.css
/usr/share/docutils/writers/s5_html/themes/default/iepngfix.htc
/usr/share/docutils/writers/s5_html/themes/default/opera.css
/usr/share/docutils/writers/s5_html/themes/default/outline.css
/usr/share/docutils/writers/s5_html/themes/default/pretty.css
/usr/share/docutils/writers/s5_html/themes/default/print.css
/usr/share/docutils/writers/s5_html/themes/default/s5-core.css
/usr/share/docutils/writers/s5_html/themes/default/slides.css
/usr/share/docutils/writers/s5_html/themes/default/slides.js