.small() {
  @media only screen and (max-width: 768px) {
    .content;
  }
}

.medium() {
  @media only screen and (min-width: 768px) {
    .content;
  }
}

.large() {
  @media only screen and (min-width: 992px) {
    .content;
  }
}

.xlarge() {
  @media only screen and (min-width: 1200px) {
    .content;
  }
}