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Ruby

Importing Bootstrap 4 Sass into a Ruby on Rails Project

I'm trying to rebuild a couple of my sites using Ruby on Rails. I'd like to import Bootstrap 4 Sass into the project so I can extend their classes and utilize their mixins. I've followed a few different tutorials but the result is still a compilation error. If I can just get the power of Bootstrap properly imported into these projects I'll be ecstatic. Any help is greatly appreciated!

Project Repository

Youtube Tutorial

Github Tutorial

p {
    @extend .text-center;
    font-size: 20rem;
    @include hover-focus {
        color: red;
    }
}

Throws this error:

Error: no mixin named hover-focus
        on line 7:14 of app/assets/stylesheets/pages.scss
        from line 1:9 of app/assets/stylesheets/application.scss
>>     @include hover-focus {
   -------------^