function issimple_content_width()
{
    if (is_full_page_template()) {
        global $content_width;
        $content_width = 1130;
        /* pixels */
    }
}
/**
 * Custom Featured Thumbnail
 * 
 * @since IS Simple 1.0
 * ----------------------------------------------------------------------------
 */
function issimple_post_featured_thumb($size = 'featured-size')
{
    $thumb_id = get_post_thumbnail_id();
    $thumb_link_full = wp_get_attachment_image_src($thumb_id, 'full');
    $thumb_link_full = $thumb_link_full[0];
    $thumb_caption = get_post_thumbnail_meta($thumb_id, 'caption');
    if (is_full_page_template()) {
        $size = 'featured-full-page-size';
    }
    $link_atts = array();
    $link_atts['class'] = 'featured-link img-link';
    $link_atts['title'] = get_the_title();
    $link_atts['href'] = is_singular() ? $thumb_link_full : get_permalink();
    $link_atts['data-lightbox'] = is_singular() ? 'post-' . get_the_ID() : '';
    $link_atts['data-title'] = is_singular() ? $thumb_caption : '';
    $link_attributes = array2atts($link_atts);
    if (has_post_thumbnail()) {
        ?>
		<figure class="post-featured-thumb">
			<a<?php 
        echo $link_attributes;
        ?>
>
				<?php 
        the_post_thumbnail($size, array('class' => 'featured-img img-responsive', 'alt' => get_the_title()));
        ?>
			</a>
		</figure><!-- .post-featured-thumb -->
	<?php 
    }
}