diff --git a/bfr-theme-plugin.php b/bfr-theme-plugin.php
index 3608b55..2885293 100644
--- a/bfr-theme-plugin.php
+++ b/bfr-theme-plugin.php
@@ -1,90 +1,72 @@
 <?php
 /**
- * The plugin bootstrap file
- *
- * This file is read by WordPress to generate the plugin information in the plugin
- * admin area. This file also includes all of the dependencies used by the plugin,
- * registers the activation and deactivation functions, and defines a function
- * that starts the plugin.
- *
- * @link              http://example.com
- * @since             1.0.0
- * @package           Plugin_Name
- *
- * @wordpress-plugin
- */
-
-/*
-Plugin Name: Biofriction - website options
-Plugin URI: https://biofriction.org/
-Description: All the <strong>options</strong> for <strong>Biofriction website</strong> wich do not come by default with wordpress such as: selector for showing buttons, a date picker for old posts, and any other needs.
-Version: 0.3
-Author URI: https://vitrubio.net/
-Author: jorge - vitrubio.net
-License: GPL 3.0
-Date: 2020 02 10
-License URI:https://www.gnu.org/licenses/gpl-3.0.html
-Text Domain:       bfr_plugin_txtdomain
-Domain Path:       /languages
+* Plugin Name
+*
+* @package           Biofriction - website options
+* @author            jorge - vitrubio.net
+* @copyright         2021 jorge - vitrubio.net & hangar.org
+* @license           GPL-3.0-or-later
+*
+* @wordpress-plugin
+* Plugin Name:       Biofriction - website options
+* Plugin URI:        https://git.hangar.org/hangar-tech/biofriction-wp-plugin
+* Description:       All the <strong>options</strong> for <strong>Biofriction website</strong> wich do not come by default with wordpress such as: selector for showing buttons, a date picker for old posts, and any other needs.
+* Version:           0.4
+* Date: 2021 11 24
+* Requires at least: 5.2
+* Requires PHP:      7.2
+* Author:            jorge - vitrubio.net
+* Author URI:        https://vitrubio.net/
+* Text Domain:       bfr_plugin_txtdomain
+* Domain Path:       /languages
+* License:           GPL 3.0
+* License URI:       https://www.gnu.org/licenses/gpl-3.0.html
+* Update URI:        https://git.hangar.org/hangar-tech/biofriction-wp-theme.git
 */
 
 /*
 if ever read this never forget to check
 howto write a pluggin by Wordpress.org
-https://codex.wordpress.org/Writing_a_Plugin
+https://developer.wordpress.org/plugins/
 and the best practices
 https://developer.wordpress.org/plugins/plugin-basics/best-practices/
-and some resources
-https://themefoundation.com/wordpress-meta-boxes-guide/
 */
 defined( 'ABSPATH' ) or die( 'No script kiddies please!' );
 
- /* *
- * Load translation, if it exists
- * * * * * * * * * * * * * * * * * * */
+// Load translation, if it exists
+function bfr_plugin_init() {
+  $plugin_dir = basename(dirname(__FILE__));
+  load_plugin_textdomain( 'bfr_plugin_txtdomain', null, $plugin_dir.'/assets/languages/' );
+}
+add_action('plugins_loaded', 'bfr_plugin_init');
 
- function bfr_plugin_init() {
- 	$plugin_dir = basename(dirname(__FILE__));
- 	load_plugin_textdomain( 'bfr_plugin_txtdomain', null, $plugin_dir.'/assets/languages/' );
- }
- add_action('plugins_loaded', 'bfr_plugin_init');
+// add settings link in pluggin page
+function bfr_plugin_plugin_action_links($links, $file) {
+  $this_plugin = basename(plugin_dir_url(__FILE__)) . '/bfr-theme-plugin.php';
+  if($file == $this_plugin) {
+    $links[] = '<a href="admin.php?page=biofriction-options">' . __('Settings', 'bfr_plugin_txtdomain') . '</a>';
+  }
+  return $links;
+}
+add_filter('plugin_action_links', 'bfr_plugin_plugin_action_links', 10, 2);
 
- /* *
- * add settings link in pluggin page
- * * * * * * * * * * * * * * * * * * */
- function bfr_plugin_plugin_action_links($links, $file) {
-     $this_plugin = basename(plugin_dir_url(__FILE__)) . '/bfr-theme-plugin.php';
-     if($file == $this_plugin) {
-         $links[] = '<a href="admin.php?page=biofriction-options">' . __('Settings', 'bfr_plugin_txtdomain') . '</a>';
-     }
-     return $links;
- }
- add_filter('plugin_action_links', 'bfr_plugin_plugin_action_links', 10, 2);
-
- /**
- * Registers stylesheet for a custom plugin.
- */
+// Registers stylesheet for a custom plugin.
 function biofriction_theme_plugin_styles_admin() {
-	add_editor_style( 'assets/css/bfr-theme-plugin.css' );
+  add_editor_style( 'assets/css/bfr-theme-plugin.css' );
 }
 add_action( 'admin_init', 'biofriction_theme_plugin_styles_admin' );
 
-/**
- * Proper way to enqueue scripts and styles
- */
+// enqueue scripts and styles
 function biofriction_theme_plugin_styles_public() {
-    $this_plugin = basename(plugin_dir_url(__FILE__));
-    wp_enqueue_style( 'bfr-theme-plugin', plugin_dir_url(__FILE__) . 'assets/css/bfr-theme-plugin.css' );
-    // wp_enqueue_script( 'script-name', get_template_directory_uri() . '/js/example.js', array(), '1.0.0', true );
+  wp_enqueue_style( 'bfr-theme-plugin', plugin_dir_url(__FILE__) . 'assets/css/bfr-theme-plugin.css' , array(), filemtime( plugin_dir_url(__FILE__) . 'assets/css/bfr-theme-plugin.css' ), 'all');
 }
-
 add_action( 'wp_enqueue_scripts', 'biofriction_theme_plugin_styles_public' );
 
- /* *
- *  Custom button in TINYMCE editor for styling
- * * * * * * * * * * * * * * * * * * * * * * */
- // as read on
- // https://codex.wordpress.org/Plugin_API/Filter_Reference/mce_buttons,_mce_buttons_2,_mce_buttons_3,_mce_buttons_4
+/* *
+*  Custom button in TINYMCE editor for styling
+* * * * * * * * * * * * * * * * * * * * * * */
+// as read on
+// https://codex.wordpress.org/Plugin_API/Filter_Reference/mce_buttons,_mce_buttons_2,_mce_buttons_3,_mce_buttons_4
 // https://www.wpbeginner.com/wp-tutorials/how-to-add-custom-styles-to-wordpress-visual-editor/
 // https://kinsta.com/blog/wordpress-tinymce-editor/
 
@@ -95,7 +77,7 @@ if ( ! function_exists( 'bfr_mce_buttons' ) ) :
     // array_unshift( $buttons, 'styleselect', 'removeformat' );
     array_push( $buttons, 'styleselect', 'removeformat' );
     return $buttons;
-}
+  }
 endif;
 // Register our callback to the appropriate filter
 add_filter( 'mce_buttons_2', 'bfr_mce_buttons' );
@@ -162,57 +144,57 @@ add_filter( 'tiny_mce_before_init', 'bfr_mce_before_init_insert_formats' );
 // }
 // add_filter( 'mce_buttons_3', 'biofriction_mce_buttons_3' );
 
- /**
- *
- *  Custom settings page
- * * * * * * * * * * * * * * * * * * /
- *
- * @internal never define functions inside callbacks.
- * these functions could be run multiple times; this would result in a fatal error.
- * https://developer.wordpress.org/plugins/settings/custom-settings-page/
- */
+/**
+*
+*  Custom settings page
+* * * * * * * * * * * * * * * * * * /
+*
+* @internal never define functions inside callbacks.
+* these functions could be run multiple times; this would result in a fatal error.
+* https://developer.wordpress.org/plugins/settings/custom-settings-page/
+*/
 
- /**
- * custom option and settings
- */
+/**
+* custom option and settings
+*/
 function bfr_settings_init() {
-   // register a new setting for "bfr" page
-   register_setting( 'bfr_settings', 'bfr_options' );
+  // register a new setting for "bfr" page
+  register_setting( 'bfr_settings', 'bfr_options' );
 
-   // register a new section in the "bfr" page
-   add_settings_section(
-     'bfr_section_olderthandate',
-     __( 'Biofrictions Options.', 'bfr_plugin_txtdomain' ),
-     'bfr_section_olderthandate_cb',
-     'bfr_settings'
-   );
+  // register a new section in the "bfr" page
+  add_settings_section(
+    'bfr_section_olderthandate',
+    __( 'Biofrictions Options.', 'bfr_plugin_txtdomain' ),
+    'bfr_section_olderthandate_cb',
+    'bfr_settings'
+  );
 
-   // register a new field in the "bfr_section_olderthandate" section, inside the "bfr" page
-   add_settings_field(
-       'bfr_field_olderthandate', // as of WP 4.6 this value is used only internally
-       // use $args' label_for to populate the id inside the callback
-       __( 'Hide content older than...', 'bfr_plugin_txtdomain' ),
-       'bfr_field_olderthandate_cb',
-       'bfr_settings',
-       'bfr_section_olderthandate',
-       [
-         'label_for' => 'bfr_field_olderthandate',
-         'class' => 'bfr_row',
-         'bfr_custom_data' => 'custom',
-       ]
-    );
+  // register a new field in the "bfr_section_olderthandate" section, inside the "bfr" page
+  add_settings_field(
+    'bfr_field_olderthandate', // as of WP 4.6 this value is used only internally
+    // use $args' label_for to populate the id inside the callback
+    __( 'Hide content older than...', 'bfr_plugin_txtdomain' ),
+    'bfr_field_olderthandate_cb',
+    'bfr_settings',
+    'bfr_section_olderthandate',
+    [
+      'label_for' => 'bfr_field_olderthandate',
+      'class' => 'bfr_row',
+      'bfr_custom_data' => 'custom',
+    ]
+  );
 }
 
 
 /**
- * register our bfr_settings_init to the admin_init action hook
- */
+* register our bfr_settings_init to the admin_init action hook
+*/
 add_action( 'admin_init', 'bfr_settings_init' );
 
 /**
- * custom option and settings:
- * callback functions
- */
+* custom option and settings:
+* callback functions
+*/
 
 // olderthandate section cb
 
@@ -220,11 +202,11 @@ add_action( 'admin_init', 'bfr_settings_init' );
 // $args have the following keys defined: title, id, callback.
 // the values are defined at the add_settings_section() function.
 function bfr_section_olderthandate_cb( $args ) {
- ?>
- <p id="<?php echo esc_attr( $args['id'] ); ?>">
-   <?php esc_html_e( 'Here you should set the options for the older content to be marked as it.', 'bfr_plugin_txtdomain' ); ?>
- </p>
- <?php
+  ?>
+  <p id="<?php echo esc_attr( $args['id'] ); ?>">
+    <?php esc_html_e( 'Here you should set the options for the older content to be marked as it.', 'bfr_plugin_txtdomain' ); ?>
+  </p>
+  <?php
 }
 
 // daysback field cb
@@ -236,102 +218,99 @@ function bfr_section_olderthandate_cb( $args ) {
 // the "class" key value is used for the "class" attribute of the <tr> containing the field.
 // you can add custom key value pairs to be used inside your callbacks.
 function bfr_field_olderthandate_cb( $args ) {
- // get the value of the setting we've registered with register_setting()
- $options = get_option( 'bfr_options' );
- // output the field
- ?>
+  // get the value of the setting we've registered with register_setting()
+  $options = get_option( 'bfr_options' );
+  // output the field
+  ?>
 
- <p class="description">
-   <?php _e( 'You should set up the <b>number of days</b> from today to the past or the date from wich will be <b>considered old posts</b>. Then the class <span style="font-family:monospace;">oldpost</span> will be added to the post and pages so you can apply a css style to your theme.', 'bfr_plugin_txtdomain' ); ?>
- </p>
- <form id="bfr-oldpost-numberofdays" class="bfr-oldpost-numberofdays">
-   <label for="bfr-oldpost-numberofdays">Number of days:</label>
-   <input type="number" id="bfr-oldpost-numberofdays" name="bfr-oldpost-numberofdays" min="1" max="100">
- </form>
- <form id="bfr-oldpost-enddate" class="bfr-oldpost-enddate">
-  <label for="bfr-oldpost-enddate">Start date:</label>
-  <input type="date" id="bfr-oldpost-enddate" name="bfr-oldpost-endate" value="">
-</form>
+  <p class="description">
+    <?php _e( 'You should set up the <b>number of days</b> from today to the past or the date from wich will be <b>considered old posts</b>. Then the class <span style="font-family:monospace;">oldpost</span> will be added to the post and pages so you can apply a css style to your theme.', 'bfr_plugin_txtdomain' ); ?>
+  </p>
+  <form id="bfr-oldpost-numberofdays" class="bfr-oldpost-numberofdays">
+    <label for="bfr-oldpost-numberofdays">Number of days:</label>
+    <input type="number" id="bfr-oldpost-numberofdays" name="bfr-oldpost-numberofdays" min="1" max="100">
+  </form>
+  <form id="bfr-oldpost-enddate" class="bfr-oldpost-enddate">
+    <label for="bfr-oldpost-enddate">Start date:</label>
+    <input type="date" id="bfr-oldpost-enddate" name="bfr-oldpost-endate" value="">
+  </form>
 
-<!-- borrar desde aqui -->
-<p>
- label_for:<?php echo esc_attr( $args['label_for'] ); ?>
- <br />
- bfr_custom_data:<?php echo esc_attr( $args['bfr_custom_data'] ); ?>
- <br />
- class:<?php echo esc_attr( $args['class'] ); ?>
- <br />
- <?php esc_html_e( 'daysback', 'bfr_plugin_txtdomain' ); ?>
- <br />
+  <!-- borrar desde aqui -->
+  <p>
+    label_for:<?php echo esc_attr( $args['label_for'] ); ?>
+    <br />
+    bfr_custom_data:<?php echo esc_attr( $args['bfr_custom_data'] ); ?>
+    <br />
+    class:<?php echo esc_attr( $args['class'] ); ?>
+    <br />
+    <?php esc_html_e( 'daysback', 'bfr_plugin_txtdomain' ); ?>
+    <br />
 
-</p>
- <!-- borrar hasta aqui -->
+  </p>
+  <!-- borrar hasta aqui -->
 
- <?php
+  <?php
 }
 
 /**
- * top level menu
- * https://developer.wordpress.org/reference/functions/add_menu_page/
- */
-  function bfr_options_page() {
-   // add top level menu page
-     add_menu_page(
-       $page_title = 'Biofriction Options', // $page_title
-       $menu_title = 'Biofriction', //$menu_title
-       $capability = 'manage_options', //'edit_others_posts', // $capability
-       $menu_slug  = 'biofriction-options', // $menu_slug
-       $function   = 'bfr_options_page_html', //$function
-       $icon_url   = 'dashicons-rest-api',// $icon_url //https://developer.wordpress.org/resource/dashicons/#menu
-       $position = '50'// $position
-     );
-  }
-
-/**
- * register our bfr_options_page to the admin_menu action hook
- */
+* top level menu
+* https://developer.wordpress.org/reference/functions/add_menu_page/
+*/
+function bfr_options_page() {
+  // add top level menu page
+  add_menu_page(
+    $page_title = 'Biofriction Options', // $page_title
+    $menu_title = 'Biofriction', //$menu_title
+    $capability = 'manage_options', //'edit_others_posts', // $capability
+    $menu_slug  = 'biofriction-options', // $menu_slug
+    $function   = 'bfr_options_page_html', //$function
+    $icon_url   = 'dashicons-rest-api',// $icon_url //https://developer.wordpress.org/resource/dashicons/#menu
+    $position = '50'// $position
+  );
+}
+// register our bfr_options_page to the admin_menu action hook
 add_action( 'admin_menu', 'bfr_options_page' );
 
-/**
- * top level menu:
- * callback functions
- */
+// top level menu: callback functions
 function bfr_options_page_html() {
-   // check user capabilities
-   if ( ! current_user_can( 'manage_options' ) ) {
-     ?>
-       <p class="description">
-         <?php esc_html_e( 'Sorry, you do not have permission to edit this settings, please, contact any admin to get granted.', 'bfr_plugin_txtdomain' ); ?>
-       </p>
-     <?php
-     return;
-   }
+  // check user capabilities
+  if ( ! current_user_can( 'manage_options' ) ) {
+    ?>
+    <p class="description">
+      <?php esc_html_e( 'Sorry, you do not have permission to edit this settings, please, contact any admin to get granted.', 'bfr_plugin_txtdomain' ); ?>
+    </p>
+    <?php
+    return;
+  }
 
-   // add error/update messages
+  // add error/update messages
 
-   // check if the user have submitted the settings
-   // wordpress will add the "settings-updated" $_GET parameter to the url
-   if ( isset( $_GET['settings-updated'] ) ) {
-     // add settings saved message with the class of "updated"
-     add_settings_error( 'bfr_messages', 'bfr_message', __( 'Settings Saved', 'bfr_plugin_txtdomain' ), 'updated' );
-   }
+  // check if the user have submitted the settings
+  // wordpress will add the "settings-updated" $_GET parameter to the url
+  if ( isset( $_GET['settings-updated'] ) ) {
+    // add settings saved message with the class of "updated"
+    add_settings_error( 'bfr_messages', 'bfr_message', __( 'Settings Saved', 'bfr_plugin_txtdomain' ), 'updated' );
+  }
 
-   // show error/update messages
-   settings_errors( 'bfr_messages' );
-   ?>
-   <div class="wrap">
-     <h1><?php echo esc_html( get_admin_page_title() ); ?></h1>
-     <form action="options.php" method="post">
-       <?php
-       // output security fields for the registered setting "bfr"
-       settings_fields( 'bfr_settings' );
-       // output setting sections and their fields
-       // (sections are registered for "bfr", each field is registered to a specific section)
-       do_settings_sections( 'bfr_settings' );
-       // output save settings button
-       submit_button( 'Save Settings' );
-       ?>
-     </form>
-   </div>
- <?php
+  // show error/update messages
+  settings_errors( 'bfr_messages' );
+  ?>
+  <div class="wrap">
+    <h1><?php echo esc_html( get_admin_page_title() ); ?></h1>
+    <form action="options.php" method="post">
+      <?php
+      // output security fields for the registered setting "bfr"
+      settings_fields( 'bfr_settings' );
+      // output setting sections and their fields
+      // (sections are registered for "bfr", each field is registered to a specific section)
+      do_settings_sections( 'bfr_settings' );
+      // output save settings button
+      submit_button( 'Save Settings' );
+      ?>
+    </form>
+  </div>
+  <?php
 }
+
+// Randomize images in gallery homepage
+// https://plugins.trac.wordpress.org/browser/random-gallery/trunk/random-gallery.php