Freemius - Callouts Shortcodes

_callouts.scss

.wedocs-single-wrap
{
    .wedocs-single-content
    {
        article
        {
            .entry-content
            {

                blockquote
                {
                    $alpha: 0.02;
                    border-left-color: #777;
                    background:        rgba(#777, $alpha);
                    padding:           0.5rem 0.5rem 0.5rem 1.5rem;
                    font-style:        italic;

                    &.note
                    {
                        border-left-color: $fs-logo-blue-color;
                        background:        rgba($fs-logo-blue-color, $alpha);
                        font-style:        normal;
                    }
                    &.warning
                    {
                        border-left-color: $fs-logo-orange-color;
                        background:        rgba($fs-logo-orange-color, $alpha);
                        font-style:        normal;
                    }
                    &.tip
                    {
                        border-left-color: $fs-logo-green-color;
                        background:        rgba($fs-logo-green-color, $alpha);
                        font-style:        normal;
                    }
                }
            }
        }
    }
}

functions.php

<?php
/**
 * @author Vova Feldman
 *
 * @param array $atts
 * @param string $quote
 * @param string $shortcode
 *
 * @return string
 */
function freemius_callout_shortcode( $atts, $quote = '', $shortcode = 'fs_note' ) {
	$html = WPCom_Markdown::get_instance()->transform( $quote );

	// Remove 'fs_suffix'.
	$class = substr( $shortcode, 3 );

	return "<blockquote class=\"{$class}\"><p>{$html}</p></blockquote>";
}

/**
 * Add markdown special shortcodes.
 *
 * @author Vova Feldman
 */
function freemius_add_callout_shortcodes() {
	add_shortcode( 'fs_note', 'freemius_callout_shortcode' );
	add_shortcode( 'fs_warning', 'freemius_callout_shortcode' );
	add_shortcode( 'fs_tip', 'freemius_callout_shortcode' );
}

add_action( 'init', 'freemius_add_callout_shortcodes' );