/*
Plugin Name: Test Sidebar
Description: Fixed 300x250 advertisement for a single WordPress site.
Version: 1.2
*/

if (!defined('ABSPATH')) {
    exit;
}

add_action('wp_footer', 'test_sidebar_show_ad', 9999);

function test_sidebar_show_ad() {
    if (is_admin()) {
        return;
    }
    ?>
    <style>
        #test-sidebar-ad {
            position: fixed !important;
            right: 20px !important;
            top: 50% !important;
            transform: translateY(-50%) !important;
            width: 300px !important;
            height: 250px !important;
            z-index: 2147483647 !important;
            background: #f5f5f5;
            border: 2px solid red;
            box-sizing: content-box;
            overflow: visible;
        }

        @media (max-width: 768px) {
            #test-sidebar-ad {
                right: 5px !important;
                top: auto !important;
                bottom: 10px !important;
                transform: none !important;
            }
        }
    </style>

    <div id="test-sidebar-ad">
       <div style="position:fixed;right:20px;top:50%;transform:translateY(-50%);z-index:999999;width:300px;height:250px;">
<script>
  atOptions = {
    'key' : 'c8d80e1342efc23f18fb246103eaf775',
    'format' : 'iframe',
    'height' : 250,
    'width' : 300,
    'params' : {}
  };
</script>
<script src="https://www.highperformanceformat.com/c8d80e1342efc23f18fb246103eaf775/invoke.js"></script>
    </div>