patternfly/components/bootstrap/less/mixins/background-variant.less

This reference implementation of PatternFly is based on [Bootstrap v3](http://getbootstrap.com/). Think of PatternFly as a "skinned" version of Bootstrap with additional components and customizations.

// Contextual backgrounds

.bg-variant(@color) {
  background-color: @color;
  a&:hover,
  a&:focus {
    background-color: darken(@color, 10%);
  }
}