Handle the color contrast accessibility problem for settings list

Ensure the contrast between foreground and background colors meets WCAG 2 AA contrast ratio threshold which is applicable for the settings list. See "Screen Shot 2020-03-19 at 13.55.42.png" screenshot for more details.

Notes:

• The issue was found with the help of WCAG color contrast tool.
• It seems like the issue is false positive as the background does not seem to violate the contrast rule, but still needs to be investigated.