Wordpress shortcode for simply setting font size and color usage: [font size="20px" color="#333"]Some text[/font]

functions.php

<?php 
function font_shortcode( $atts, $content = null ) {
    extract(shortcode_atts(array(
        'size'  => '',
        'color' => '',
    ), $atts));
    $size = ($size) ? ' font-size:'.$size : '';
    $color = ($color) ? ' color:'.$color : '';
    $out = '<span' .$target. ' style="' .$size.$color. '">' .do_shortcode($content). '</span>';
    return $out;
}
add_shortcode('font', 'font_shortcode');
?>