The color contrast for the description text in the bpmn.io sidebar isn't satisfying the AA nor the AAA success criterium. The foreground color is rgb (153,153,153) while the background is a complete transparent black rgba(0,0,0,0) (which is odd and something I would try to avoid to prevent surprises). Nevertheless the contrast is around 2,7:1 but should be at least 4,5:1 for regular text or 3,5 for large scale text. In case of the description text the contrast should be 4,5:1 for satisfying the AA success criterium (for this font size 7:1 would be necessary for AAA)
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