take lib out of gitignore
remove the background context in the sandbox, and make the background lighter
set font/colors on body and pane (not typography and code)
invert colors on "active" buttons
add padding to code sections
split pane and frame into separate patterns
clean up alignments of panes inside (tabbed-) frames
pane examples
move box-sizing into reset.css
use checkerboard background for example buttons

+ use box-shadow for pane edges
reference external libraries from CDN

- except mkay which isn't hosted anywhere