react-toolbox/components/button/_mixins.scss

@mixin btn-colors($name, $color, $background, $hover) {
  .#{$name}:not([disabled]) {
    &.raised, &.floating {
      color: $color;
      background: $background;
    }
    &.flat, &.toggle {
      color: $background;
      &:focus:not(:active) {
        background: $hover;
      }
    }
    &.flat:hover {
      background: $hover;
    }
  }
}