Go to Bootstrap CDN.
https://www.bootstrapcdn.com/
Copy & paste the desired library into the <head> tag of your document, above all other CSS files. This is the last version 4 released by Bootstrap.
Bootstrap 4 reached end of life on January 1, 2023. As such, it receives no new features, updates, or security fixes.
<link rel="stylesheet" href="https://cdn.jsdelivr.net/npm/bootstrap@4.6.2/dist/css/bootstrap.min.css">
NOTE: As of 2025, the current Bootstrap version is 5.3.
https://getbootstrap.com/docs/5.3/getting-started/introduction/
Nancy O'Shea— Product User, Community Expert & Moderator
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