Download > Install > Activate. Use your favorite IDE or just edit within the WordPress plugin editor. Change the location on the screen, colour, size, and more.

A fun project plugin but can be used to link an image or the like. About 50% down and 95% to the right on the screen as a 2px X 2px red dot. I also wrapped it in a link to this page. Code includes (commented out) just a dot without link and adding a static image, with a picture of a house fly in the plugin download folder. Looks like there's a fly on the screen!

This code can be pasted into the functions.php file of your child theme or, download and install the plugin for simple code activation.

<?php
/*
Plugin Name: Lightweight Plugins - Dead Pixel
Plugin URI: https://lightweightplugins.com/plugin/dead-pixel
Description: Puts a static red dot on the screen mimicking a dead pixel. Code include static image and link options too.
Version: 1.4
Author: WP Maintenance Experts
Author URI: https://wpmaintenanceexperts.com/
License: GPLv2 or later
*/

function lightweight_plugins_dead_pixel() {
	
// 	Uncomment below echo for just a dot
//  echo '
';

// 	Uncomment below echo for add a link
	echo '
 
'; 

// 	Uncomment below echo for add an image
// 	echo '
  
';
	
}
add_action('wp_body_open', 'lightweight_plugins_dead_pixel');