fix(NovoDataTable): making pagination marker background color dynamic

[dvoegelin]

Description

This resolves issue #1267 by making the background of the data table pagination marker dynamic. instead of a hardcoded color, it's now simply black with an opacity of 10%, so it will render as whatever color the header is, just slightly darker.

Verify that...

• Any related demos were added and npm start and npm run build still works
• New demos work in Safari, Chrome and Firefox
• npm run lint passes
• npm test passes and code coverage is increased
• npm run build still works

Bullhorn Internal Developers

• Run Novo Automation

Screenshots

[bvkimball]

I think this is just a Quick fix. On darker backgrounds it probably should inverse, and font-text should update.