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As described in the GitHub issue linked to below, there is a problem with relative paths in the minified version of airspace.css. The problem occurs because the relative paths are defined from the css directory, but the minified version of the file is put in a different directory. Three solutions are described in the issue, but the task is to implement solution #1: move the minified file (renamed) to the css directory. This will require you to also update the path in _layouts/base.html, where the minified file is imported. Once you are done, the are four different places where imports would have failed, most notably the background image for the div near the top of the main page. Please test to ensure all four relative paths are being properly imported.