.hidden {
  display: none;
}

.unselectable {
  -webkit-user-select: none;
  -khtml-user-select: none;
  -moz-user-select: -moz-none;
  -o-user-select: none;
  user-select: none;
}

.clearfix {
  &:before,
  &:after {
    content: " ";
    display: table;
  }

  &:after {
    clear: both;
  }
}