Added styles to support input boxes with no labels

[Blackbaud-PaulCrowder]

No description provided.

[blackbaud-ado]

Preview build at https://host.nxt.blackbaud.com/skyux-forms?_sp.spa=pr-input-box-no-label

[blackbaud-ado]

Preview build at https://host.nxt.blackbaud.com/skyux-forms?_sp.spa=pr-input-box-no-label

[codecov]

Codecov Report

Merging #178 into master will not change coverage.
The diff coverage is n/a.

@@            Coverage Diff            @@
##            master      #178   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files           29        29           
  Lines          862       862           
  Branches       164       164           
=========================================
  Hits           862       862           

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[Blackbaud-PaulCrowder]

/azp run

[blackbaud-ado]

Preview build at https://host.nxt.blackbaud.com/skyux-forms?_sp.spa=pr-input-box-no-label