Wordpress with ACF - add background color to category / categories

gistfile1.txt

function add_blog_category_color(){
	$categories = get_categories(array( 'hide_empty' => 0, ));
	if ( ! empty( $categories ) ) {
		echo '<style type="text/css">';
			foreach( $categories as $category ) {
				$category_taxonomy = $category->taxonomy;
				$category_id = $category->term_id;
				$category_slug = $category->slug;
				$category_color = get_field('blog_category_color',$category_taxonomy . '_' . $category_id);
				if (!empty($category_color)) {
					echo '.blog-category-color--' . $category_slug . '{background-color:' . $category_color . '!important}';
				}
			}
		echo '</style>';
	}
}
add_action('wp_head','add_blog_category_color');