Thanks for an interesting question. A Google search will reveal that it has been asked many times over the years, with a wide range of answers.
Your test page has an img tag within an a tag within a div tag. Searching on “image within div” gives many results, including this promising entry:
Auto resize an Image to fit into a HTML Div using CSS
This is not an MLA-specific issue; the solution lies in your application’s HTML and especially CSS code. Your site has a complex “autoptimize” theme/stylesheet; you will have to find a solution there.
I am marking this topic resolved because the solution is outside the scope of MLA. I regret my CSS skills are not sufficient to give you more specific guidance, but I wish you every success in finding a solution for your application. If you do find a solution that would interest other MLA users I encourage you to post an update here. Thanks for your understanding.
pro-tip; you can disable Autoptimize on a per-request basis by adding ?ao_noptimize=1 to the URL.
hope this helps debugging,
frank
