echase

This is brilliant! I propose: 1. Pencil icon UI (More compact than "mix"; represents "custom") 2. Pass user input ~verbatim as CSS attribute -> allows var() and calc() functions as...

I used a negative value for the position, like: div.slider-nav span.right { background: url(orbit/right-arrow.png); right: -78px; } (This stuff is under the "DIRECTIONAL NAV" section in the CSS)