Clean up CSS from Inkscape cruft
Clean up CSS from Inkscape cruft

The changes in c773e89bdb46bb73ffef98870cb539021596a945 brought a lot of inert/redundant CSS from Inkscape's default export.
This commit cleans them up, and fixes the formatting of the remaining rules to be consistent with the rest of the file.
These changes should produce no visible differences to the rendered page.
8values/8values.github.io,8values/8values.github.io