Bootstrap is an open-source components library for developing with HTML, CSS, and JS. Bootstrap let you immediately prototype your ideas or create your entire web application with Sass variables and mixins, responsive grid system, components, and great plugins built on
Sass is the most sophisticated, stable, and powerful professional-grade CSS extension language in the world. Sass makes CSS fun again. Sass is an extension of CSS, combining nested rules, variables, mixins, selector inheritance, and even more. It's turned to well-formatted, standard CSS using the command-line tool, or a plugin for your build system.
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