@function breakpoint($breakpoint) {
  @if $breakpoint == $document-width {
    @return $document-width - 1;
  }
  @if $breakpoint == $tablet-device-width {
  	@return $tablet-device-width - 1;
  }
  @if $breakpoint == $min-device-width {
  	@return $min-device-width + 1;
  }
}