@kuroshitsujis-things and @into--the--abyss, here’s how I got my Sebastian dashboard theme!
First off, install the Stylish extension! It’s available for three browsers so far:
Firefox <-- This is the browser I like to use, so I’ve installed the extension here!
There’s a similar extension here for Safari that is supposed to work the same way as the original Stylish, but I don’t have a Mac, so I don’t know much about it!
After installing the extension, you can use the styles provided on this website to jazz up your browser or websites like Facebook, YouTube and Tumblr (though I recommend using it for Tumblr because the themes for Facebook and YouTube are either outdated or heavy on your browser).
Here are the Tumblr themes! Some themes act like XKit extensions and fix a lot of the problems the recent updates have brought, while others are more customizable like this one, which is one of my favorites!
The Sebastian theme I use is this one! I installed it after the one linked above, and it changed the font a little bit (idk if it’s a bug or if it comes with the theme, let me know if you install this!) The Kuroshitsuji logo doesn’t appear on top of my icon (that’s probably because of the Tumblr update, though), and this theme shifts everything to the left. I’ve noticed that when you search for posts, this theme tends to maintain its left indent and doesn’t let you view some posts D: Otherwise, it’s a great theme and easy on the eyes! The dashboard theme is updated almost immediately after you install it, you don’t have to close the tab or reload it!