I did!! Also realised that it didn’t work before because I just added the sizes with the class selectors (omitting the img).
Thanks so so so much for your help and patience.
On the top and bottom of the page.
Can you open the link in Safari? Or on a mobile? They are showing in the correct places there.
Thanks for the response and links.
So the remaining http: urls are removed, the green padlock is there and there are no more security alerts. But the svgs are still not showing in Firefox and Chrome.
When I added the height and width in pixels, the pages do not load. Very confusing.