bulma/docs/_sass/examples/mixins.scss

.bulma-arrow-mixin {
  @include arrow(purple);
}

.bulma-hamburger-mixin {
  @include hamburger(2.5rem);
}

.bulma-delete-mixin {
  @include delete;
}

.bulma-loader-mixin {
  @include loader;
}

.bulma-block-mixin {
  @include block(1rem);
}

.bulma-fa-mixin {
  @include fa(1rem, 2rem);
  background-color: lavender;
}