/// Defines color scheme for Flash modifier classes to use.
/// @group layout
/// @author Richard Davis
/// @param {Color} $_flash_color - The color base of the flash color scheme.
/// @example
///   @include flash-color-scheme($gray-50);
@mixin flash-color-scheme($_flash_color) {
  background-color: lighten($_flash_color, 25%);
  color: darken($_flash_color, 40%);
  border-color: darken($_flash_color, 20%);
}