.btn{
  // social buttons
  &.btn-facebook {
    @include social-buttons-color($facebook, $facebook-states);
  }
  &.btn-twitter {
    @include social-buttons-color($twitter, $twitter-states);
  }
  &.btn-pinterest {
    @include social-buttons-color($pinterest, $pinterest-states);
  }
  &.btn-google {
    @include social-buttons-color($google-plus, $google-plus-states);
  }
  &.btn-linkedin {
    @include social-buttons-color($linkedin, $linkedin-states);
  }
  &.btn-dribbble {
    @include social-buttons-color($dribbble, $dribbble-states);
  }
  &.btn-github {
    @include social-buttons-color($github, $github-states);
  }
  &.btn-youtube {
    @include social-buttons-color($youtube, $youtube-states);
  }
  &.btn-instagram {
    @include social-buttons-color($instagram, $instagram-states);
  }
  &.btn-reddit {
    @include social-buttons-color($reddit, $reddit-states);
  }
  &.btn-tumblr {
    @include social-buttons-color($tumblr, $tumblr-states);
  }
  &.btn-behance {
    @include social-buttons-color($behance, $behance-states);
  }
}