Contrast on images in the listing pages.

[zoltan-dulac]

For the following pages, there are icons next to the pages listed in the content:

https://www.useragentman.com/enable/controls-section.php
https://www.useragentman.com/enable/forms-section.php
https://www.useragentman.com/enable/content-section.php
https://www.useragentman.com/enable/code-patterns-section.php

I would like to ensure that there is sufficient colour contrast for all images with the background in both light and dark mode.

I would like you experiment with putting these rules inside the svg code itself using the <style> tag. Note I am not 100% sure this will work in all browsers, so please do a proof of concept first to see if this is doable. If this doesn't work, then we should figure out an alternative way of doing this.