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Cascading Style Sheets is a style sheet language used for describing the
presentation of a document written in a markup language like HTML.
CSS is a cornerstone technology of the World Wide Web, alongside HTML and
JavaScript.
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Uncheck Guild Install in the Installation tab and try again!
Answer source: https://www.reddit.com/r/Discord_Bots/comments/1e6r0ua/private_application_cannot_have_a_default/