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Sometimes the images may be too big for the page. The built-in CSS rules specify a maximum size for images, limiting to the width of the parent block. But if the parent block is itself too wide and bleeds out of page, you might consider specifying a length.

In your customization css, add the following snippet:

  *[class ~= "topic/image"] {
    ...
        /* The US-letter page size minus page margins. See p-page-size.css for the current page size. */
        max-width: 6.5in;         
    }