adding styling to question choices

[Jen-Harris]

relates #82 is designed as mobile first and has moderate compatibility with desktop. very simple & hopefully quite clear

[codecov[bot]]

Codecov Report

Merging #83 into master will not change coverage. The diff coverage is n/a.

@@           Coverage Diff           @@
##           master      #83   +/-   ##
=======================================
  Coverage   95.69%   95.69%           
=======================================
  Files          13       13           
  Lines          93       93           
  Branches        4        4           
=======================================
  Hits           89       89           
  Misses          4        4

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[Jen-Harris]

merge conflict resolved @rachaelcodes