I switched from "width=400" to "width=90%" and was very happy with the results on MY screen. That re-sized the entire width of the Oracle itself to the original size (before pics) and the pics/graphics were more centered.
I was under the impression that "width=90%" sized pics/graphics to each individual's device, like it did for mine.
Apparently, that's not right.
I'll return to using "width=400" in the future, and sacrifice my personal satisfaction and Oracle perfection for the common good of my faithful readers.
Masterful Oracles, Bagster!
Thank you for persevering!