This perhaps raises issues like I reported long ago.
For example, yellow chords are my favourite because they stand out in-line with the lyrics and work great for me on a black/dark tablet screen but they are near-useless when printed on white paper. In that case, I believe some colours should be swapped, perhaps brown for yellow (discuss) because brown is rarely used for a black background target device. Maybe someone has a 'standard' swap list for this? As it stands, when I print for someone, I change my chords colour to Red for printing and back again for normal use (pest). Other colours are used less and/or are not a problem. Normal white text changes to black on its own, of course. Maybe a set of preferences for swap colours? Maybe yellow on white and brown on black are the only real problems.
Chords are not - and don't need to be - coloured on the website.