AO3some

All my previous styles have been updated to work with the new skin so check for updates if you have them installed.
I've also made a few more for little things which didn't work for me:

-- Offwhite Background: I don't know if it used to be the default background or the one of the skin I used but this is what I had and my eyes missed it.

-- Redesign Boxes: the inset thing really doesn't work for me so this will make the boxes look like they did before (popping out instead of sunken), with sharper and darker borders to better separate elements.

-- Redesign Header: the right side of the header (icon, 'post new' and 'log out') looks weird for me so this swaps things around: the two buttons go up with the other buttons in the bar and look like them (same style, same font size), the icon goes below the bar and is shrunk to 75%.

Edit: comments here and there have made me edit this style to make it a little smarter. It gives you additional choices now such as the possibility to hide your personal icon entirely and/or the AO3 logo, and to move content up a bit to make up for the lost space.

If you notice any issue, please let me know.

I won't bring any of my styles over on AO3 because I don't think the interface is easy to use but, if it works better for you, don't hesitate to install these using AO3's interface. Just copy/paste the code, I guess.

I've made a simple style to make reading works on AO3 even easier than it already is (in my opinion, of course). You can choose the font type and size, the leading (vertical space between lines) the text alignment and the size of the side margins. I debated over adding text and background colors too but I feel these fit better with a full site skin. My style only applies to work text.

If you're interested, you can find it here. Feedback and suggestions are welcome!

Note: Stylish is a Mozilla Firefox extension but it can also work with other browsers.