Jun Pataleta 73126a6767 MDL-69392 theme_classic: Darken red, blue and green colours
The current red, blue, and green colours achieve the minimum colour
contrast against a white background. However, when they're against
coloured background, text with these colours will easily fail the
4.5:1 contrast ratio requirement for Level AA.
The updated colours now have the following contrast ratio against a
white background:
* Blue  - #0f6fc5 (5.12:1, from 4.58:1)
* Green - #357a32 (5.27:1, from 4.63:1)
* Red   - #ca3120 (5.29:1, from 4.59:1)
2020-10-21 14:11:07 +08:00
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