function twenty_twenty_one_generate_css( $selector, $style, $value, $prefix = '', $suffix = '', $display = true ) {

  // Bail early if there is no $selector elements or properties and $value.
  if ( ! $value || ! $selector ) {
    return '';
  }

  $css = sprintf( '%s { %s: %s; }', $selector, $style, $prefix . $value . $suffix );

  if ( $display ) {
    /*
		 * Note to reviewers: $css contains auto-generated CSS.
		 * It is included inside <style> tags and can only be interpreted as CSS on the browser.
		 * Using wp_strip_all_tags() here is sufficient escaping to avoid
		 * malicious attempts to close </style> and open a <script>.
		 */
    echo wp_strip_all_tags( $css ); // phpcs:ignore WordPress.Security.EscapeOutput
  }
  return $css;
}