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Hey Man,
Firstly: Thank you for thinking my script is good enough to use in yours (YouTube Black Theme), I wouldn't have minded if you would have asked me first, but it isn't that big of a deal.
Secondly, I have recently added a lot more CSS rules to the script and looked at the version you were using, and it is quite a bit out of date. You should use my latest version (I don't believe I will update it for quite a long time, everything is supported). Here is the new URL you should @require: https://greasyfork.org/scripts/8011-youtube-black-theme-library/code/Youtube%20Black%20Theme%20Library.js?version=43419 .
Thanks again for the support :)
Daniel