Here is where we look at Drupal modules running on less than 1% of reporting sites. Today we'll consider Sticky Navigation, a module which allows you to easily ensure your navigation remains within the viewport.
EDIT: The module's maintainer, skein, was kind enough to review the video and he highlighted that this module attaches a class to the sticky element which makes styling it easier.
EDIT II: Since the recording of this video I've found drupal.org/project/floating_block which provides similar functionality and is worth your consideration, as well.
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