What does this mean?
To comply with the strictest accessibility standard (WCAG AAA), the colour of text must strongly contrast with its background color, so that people with significant visual impairments can read it.More help
The contrast ratio must be at least 7:1 for body text, and 4.5:1 for large text.
A far less demanding version of this check (1.4.3) exists for WCAG AA. All websites should aim to meet the easier AA standard at a minimum. The AAA standard is desirable but far more challenging, and may not be practical for your website.
How close this website is to fixing this issue.
This is probably because we're still working on this. Take a look at another issue.