Custom snippet for making the Select Sites box sticky

sticky-select-sites.php

<?php 

// Add the following code snippet to the functions.php file of the MainWP Customisations plugin
// Download MainWP Customisations here: https://github.com/mainwp/mainwp-customisations
// More about the plugin: https://mainwp.com/mainwp-customisations/

add_action('admin_head', 'sticky_sidebar');
function sticky_sidebar() {
  echo '<style>.mainwp_select_sites_box { position: -webkit-sticky; position: sticky; top: 0; }</style>';
}

?>