Increase width of menu by one half
Add extra padding in and after selected / total in filters
Set reset link and total authors selected in bold
Move reset link after display of authors selected / total
Reduce font size from 10px to 8px in lists
Remove TODO in CSS

The style is specific, there is no need to define a CSS class;
using an identifier is appropriate.
Adjust page margins
Remove unused styles (no more h1 in document)
Remove margins above/below fieldset
Style h2: margin top, underline
Shift menu down by 6em (on top of page margin)