Dark mode UI issues

[chatRG]

Describe the bug
Texts are almost unreadable in dark mode.

To Reproduce
Steps to reproduce the behavior:

1. Go to demographics page
2. See error

Expected behavior
A clear and contrast view of text as some user may be color blind and even for normal user it is very hard to read that grey text and the blue text over blue background.

Screenshots
You can see the contrast ratio score in chrome itself.

Desktop (please complete the following information):

• OS: windows 10
• Browser chrome
• Version 81

Additional context
Better to check this site for reference on setting color contrast for better readability: https://contrastchecker.com/

[jeremyphilemon]

Closing in favor of #1417, let's track the issue there :)