.error, #flash_failure {
  @include flash($error-color);
}

.notice, #flash_notice {
  @include flash($notice-color);
}

.success, #flash_success {
  @include flash($success-color);
}

%flash-error,
#flash_failure {
  @include flash($error-color);
}

%flash-notice,
#flash_notice {
  @include flash($notice-color);
}

%flash-success,
#flash_success {
  @include flash($success-color);
}

Make flash classes into placeholder selectors
Make flash classes into placeholder selectors
