Hi Ced, the v4 SidePane.htm is about 95% the same as v3, there are some tweaks to CSS values and a couple of small structural changes like a an additional <div> wrapper around palette content, to adapt to changes in the HTML rendering engine. It's now using a newer version of WebKit and there a few differences in behavior from the old one to have better HTML standards compliance. Also MoI v3 was using an early version of flexbox containers that is now deprecated in WebKit, I've switched over to using the standard flexbox now so there are a few changes to CSS property names and container structures because of that.

Overall the changes are small tweaks though, nothing major. However, it won't work to just copy the entire v3 UI completely over, you'll have to reapply your changes within the new UI.

- Michael