add present gift for dark background

[eighnjel]

Overview:

• Add present icon for dark backgrounds (see below for current and new)

Screenshots/GIFs:

Testing:

• [ ] Unit tests
• Manual tests:
  • [ ] Chrome
  • [ ] Safari
  • [ ] IE10

Roll Out:

• Before merging:
  • [ ] Updated docs
  • [ ] Bumped version in package.json
    • Breaking change? Run npm version minor
    • Backward compatible change? Run npm version patch
    • Only changing documentation? All good. Skip this step.
• After merging:
  • [ ] Deployed updated docs (make deploy-docs)

[CarlNelson]

We might want to adjust the colors of the dark background version. The white outline + dark background of the gift is a bit intense.

[eighnjel]

cc @mischelle-m who's working on it

[mischelle-m]

changed white outline into @neutral_silver to reduce the intense contrast, thoughts @CarlNelson?

[CarlNelson]

Still very visually jarring, let's chat.

[eighnjel]

We're just going to change this, so we can pause on iteration for now.