boostrap 4

Bootstrap 4 is the newest version of Bootstrap; with new components, faster stylesheet and more responsiveness. However, Internet Explorer 9 and down is not supported.

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boostrap 5

Bootstrap is a free and open-source collection of CSS and JavaScript/jQuery code used for creating dynamic layout websites and web applications. ... 1 which now has a lot of vital features such as cards, flexbox, Sass integration and powerful plugins built on jQuery

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