bootsrap 4 theming change colors with Sass
Max: Bootstrap 4 Theme Customization (with Sass) | BOOTSTRAP 4 TUTORIAL
How to customize Bootstrap 4 using Sass https://www.mugo.ca/Blog/How-to-customize-Bootstrap-4-using-Sass
Now, theming is accomplished by Sass variables, Sass maps, and custom CSS. There’s no more dedicated theme stylesheet; instead, you can enable the built-in theme to add gradients, shadows, and more.
Assuming you’re using a package manager like npm
https://getbootstrap.com/docs/4.0/getting-started/theming/
Sass Basics https://sass-lang.com/guide
How to Customize Bootstrap https://bootstrap.themes.guide/how-to-customize-bootstrap.html
https://bootstrap.themes.guide/how-to-customize-bootstrap.html https://bootstrapcreative.com/customize-bootstrap-colors/
Color palette generator https://loading.io/me/
Multi mix: https://www.schemecolor.com/multi-mix2.php