Fix part number vertical alignment in guides
Fix part number vertical alignment in guides

https://www.pivotaltracker.com/story/show/67464120

kalleth/static,tadast/static,tadast/static,kalleth/static,robinwhittleton/static,robinwhittleton/static,alphagov/static,tadast/static,tadast/static,kalleth/static,robinwhittleton/static,robinwhittleton/static,alphagov/static,alphagov/static,kalleth/static