Customize TinyMCE in WordPress

function.php

<?php 
// Customize Font Family, Size, and Color Options
function vital_tinymce($options) {
    $options['fontsize_formats'] = '0.75em 0.875em 1em 1.125em 1.25em 1.375em 1.5em 1.75em 1.875em 2em';
    // Color Picker
    $options['textcolor_map'] = '['.'
        "ffffff", "White",
        "000000", "Black"
    '.']';
    // Font Families
    // The last family listed must NOT have a semicolon before the closing quote
    $options['font_formats'] = 'Helvetica=Helvetica, Arial, sans-serif;'.
                               'Georgia=Georgia, Cambria, Times New Roman, Times, serif';
    return $options;
}
add_filter('tiny_mce_before_init', 'vital_tinymce');

// Custom Text Styles (Formats)
function vital_tinymce_styles($custom_styles) {
    $styles = array(
        array(
            'title' => 'Text',
            'items' => array(
                array(
                    'title' => 'Intro Text',
                    'selector' => 'p',
                    'classes' => 'intro-text',
                    'wrapper' => false
                ),
                array(
                    'title' => 'Pull Quote',
                    'selector' => 'p',
                    'classes' => 'pull-quote',
                    'wrapper' => false
                )
            )
        ),
        array(
            'title' => 'Buttons',
            'items' => array(
                array(
                    'title' => 'Red Button',
                    'selector' => 'a',
                    'classes' => 'red-button',
                    'wrapper' => false
                ),
                array(
                    'title' => 'Blue Button',
                    'selector' => 'a',
                    'classes' => 'blue-button',
                    'wrapper' => false
                )
            )
        ),
        array(
            'title' => 'Blocks',
            'items' => array(
                array(
                    'title' => 'Call to Action',
                    'block' => 'div',
                    'classes' => 'cta',
                    'wrapper' => true
                )
            )
        )
    );
    $custom_styles['style_formats'] = json_encode($styles);
    return $custom_styles;
}
add_filter('tiny_mce_before_init', 'vital_tinymce_styles');
?>