Style the decimal values in prices in WooCommerce

add_filter( 'formatted_woocommerce_price', 'ts_woo_decimal_price', 10, 5 );
function ts_woo_decimal_price( $formatted_price, $price, $decimal_places, $decimal_separator, $thousand_separator ) {
    $unit = number_format( intval( $price ), 0, $decimal_separator, $thousand_separator );
    $decimal = sprintf( '%02d', ( $price - intval( $price ) ) * 100 );
    return $unit . '<small>' . $decimal_separator. $decimal . '</small>';
}

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