Some things aren't really well displayed in the current CSS (most notably nested lists) and are really well conveyed in that manor (notes). I think either modifiable CSS per thought plan (like subreddits) or more sets of CSS would be a huge improvement that shouldn't be especially difficult depending on how this is set up.
Jason Shi commented
You can modify some of Thought Plan's CSS and add your own JS yourself via Minimalist for Everything, an extension on the Chrome Web Store, so if you aren't comfortable with what Thought Plan looks like right now, you can already use that extension to fix whatever the problem is on your own, while everyone else has to wait for the fix.
Hey Timothy, thanks for posting here! There is already a suggestion for theming capabilities (http://thoughtplan.uservoice.com/forums/264068-feature-requests/suggestions/6439366-add-support-for-different-themes-fonts-styles) but this is not super-high priority at the moment.
Can you maybe post an example of a nested list or anything that isn't displayed well (using the share-feature) and I'll fix it. Thanks!