Fix Sketchfab viewer sizing

[0kyn]

Fixes

Fixes #237 by @zackkrida

Description

This PR fixes Sketchfab viewer size, it applies same CSS rules from previous website: http://search.creativecommons.org/photos/6b57230c-6601-476e-a04c-1456d02c9b14

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[zackkrida]

Thank you! I made a small revision to the css class name and also took this opportunity to update the sketchfab viewer JavaScript to the latest version.