fix(Balloon): strengthen robustness for align, close#517

[youluna]

close #517

[codecov]

Codecov Report

Merging #524 into master will increase coverage by <.01%.
The diff coverage is 100%.

@@            Coverage Diff            @@
##           master    #524      +/-   ##
=========================================
+ Coverage    91.1%   91.1%   +<.01%     
=========================================
  Files         243     243              
  Lines       13637   13639       +2     
  Branches     4229    4230       +1     
=========================================
+ Hits        12424   12426       +2     
  Misses       1194    1194              
  Partials       19      19

Impacted Files	Coverage Δ
src/balloon/balloon.jsx	95.16% <100%> (+0.16%)	⬆️

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