/// Returns a transparent black color
//// @group Colors
/// @param {value} $opacity [.8] - opacity value
@function black($opacity: .8) {
  @return rgba(0, 0, 0, $opacity);
}

/// Returns a transparent white color
//// @group Colors
/// @param {value} $opacity [.8] - opacity value
@function white($opacity: .8) {
  @return rgba(255, 255, 255, $opacity);
}