I tried a number of approaches but none of them work.
Such as what?
Have you tried to insert an extra style like:
img {
width: 100%;
}
Where is your live test page for people to see it.
-- Windows-10: <news://freenews.netfront.net/alt.comp.os.windows-10> Windows-8: <news://freenews.netfront.net/alt.comp.os.windows-8> Windows-7: <news://freenews.netfront.net/alt.windows7.general> Windows XP: <news://freenews.netfront.net/microsoft.public.windowsxp.general> Windows-XP: <news://freenews.netfront.net/microsoft.public.windowsxp.general> Firefox: <news://freenews.netfront.net/alt.comp.software.firefox> Thunderbird: <news://freenews.netfront.net/alt.comp.software.thunderbird> Google Groups: <https://groups.google.com/g/microsoft.public.windowsxp.general>