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I’m trying to style my K2 SmartForms (by Nintex) using Bootstrap 5 with SASS.

However, SmartForms have their own generated HTML structure and styles that often conflict with Bootstrap’s classes and layout system. I’d like to integrate Bootstrap 5 styling (grids, buttons, forms, spacing utilities, etc.) without breaking SmartForms functionality.

What I’ve tried:

  • Added Bootstrap 5 compiled CSS and JS files to the SmartForms theme via StyleProfile (External css & js files)

  • Attempted to override K2 default styles using custom SASS variables.

  • Scoped Bootstrap with a parent class to avoid global conflicts — but that breaks layout consistency.

  • Tried recompiling Bootstrap with custom variables and a namespace.

My questions:

  1. What’s the best way to integrate Bootstrap 5 with K2 SmartForms while keeping both systems functional?

  2. Should I compile Bootstrap with a custom namespace using SASS?

  3. Is there a recommended or supported approach by Nintex for using modern frameworks like Bootstrap 5 with SmartForms?

Environment:

  • K2 Five (latest version)

  • Nintex K2 SmartForms

  • Bootstrap 5.3

  • SASS

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