dark background on filters (again)

not sure if I did it wrong somehow (I've been working with chrome's
element inspector, modifying the stylesheet) or if it just needs this on
this page. Either way, it works now.
make the X's brighter overall.

The X's were too dark everywhere because they use 0.2 opacity and the
background had darkened. So turn up the opacity a bit (0.4 instead of
0.2).
Set button backgrounds on sg+ settings
Add more padding to sg+ changelog link

the element ended at the immediate right of the text, which looked kinda
funny
tabs

oops
make the text in the tagged user box easier to read

Too lazy to mess with colors. Just remove the shadow. Someone else can
do it properly.