I’ve spent the last three weeks or so digging through Wanikani’s CSS and making much-desired improvements to the new UI. These will hopefully make many people very happy 
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Features
The padding on subject items is reduced to make them smaller and easier to read. The gap between items in the level progress widget has also been reduced, letting you see more before you have to scroll.
Hovering over a radical or kanji in information pages now zooms in on it more and removes the ugly white background.
Text highlights and the contrast between primary and secondary readings have been improved and look more or less how they used to.
Vocabulary and search results now display as a list (hooray!). The radicals and kanji in subject lists have been increased in size and are now readable, with the white background removed.
Installation
Make sure you have a custom CSS extension, such as Stylus for Chrome/Firefox. For mobile devices there’s Makeover for iOS (only works with small amounts of code) and Stylus for Firefox Android (not yet tested).
To install on Desktop, find the style here and click install, then install again.
Final Thoughts
My fingers are still crossed that Wanikani will make official changes similar to these, eliminating the need for an extension, but for now hopefully this makes Wanikani nicer to use and eliminates (or at least reduces) the most egregious user experience downgrades from the update.
