Fix color contrast in search results

[atsansone]

Hotlist: https://buganizer.corp.google.com/hotlists/5891206
Bug: https://buganizer.corp.google.com/issues/338014334

Observed Results

Some links and text in the page do not have minimum colour contrast ratio of 4.5/1.

• Screencast.
• Screencast

Expected Results

The content of the page should have a minimum colour contrast ratio of 4.5/1.

User Impact

Users who use forced colors will not be able to read or interact with the content which does not have minimum colour contrast ratio which will lead to loss of context. This will effect users with Low vision, colour blindness.

Steps To Reproduce

1. Enable High contrast mode.
2. Go to https://dart.dev/search?cx=011220921317074318178%3A_yy-tmb5t_i&ie=UTF-8&hl=en&q=isolate.
3. Using the Tab key, navigate to "search" and type "isolate" and search.
4. Navigate through the search results and observe contrast.

Relevent GAR Sheet

A11Y Tracker.

GAR Details

1.14. Is there sufficient color contrast between the text/icons and the background?

Additional Info

A second video has been attached since there several elements that have the same color contrast issue
in the following https://dart.dev/codelabs/async-await). This in order to don't make a duplicate bu.

Environment Details

• Machine: Chromebook.
• Browser: Chrome (123.0.6312.112 (Official Build) (64-bit)).
• Accessibility Tool: High contrast mode.
• Bug Filling Time: 10 mins.