Themes looking wierd

[neroist]

• [x] Fix Attri show source button clipping off at end

• [x] Fix Awsm Mischka code background color bending in too much

• [x] Add some padding for Pico

• [x] W3c Midnight has uneven left/right padding

• [x] Make footer bottom padding on Mercury larger

• [x] #7

• [x] Fix Attri Bright Light Green footer-left text color is too dark

• [x] Writ images...

[neroist]

MVP anchors seem intentional, so I won't "fix" anything.

[neroist]

I'll stick with white for the pink themes.