bug fix (addons/viewport): viewport iframe dimensions #5993
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Issue: #5927
What I did
Use
boxSizing: 'content-box'
to override the global box-sizing ruleand allow the storybook preview iframe to have the specified dimensions
from the viewport addon config.
Fixes #5927
How to test
Before. Incorrect viewport iframe size:

After. Corrected viewport iframe size:

No (but I don't actually know).
No.
No.