Floating pictures (those with text wrapping) are anchored to paragraphs which may or may not actually correspond with the position of the graphic.

If you want to apply a style to the graphic then you need to change the positioning of the graphic to "in line with text" and put them in their own paragraph.

You could create an empty paragraph and move the graphic's anchor to that paragraph. This would allow you to apply a style to that paragraph but I don't see the point.

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Andrew Lockton
Chrysalis Design, Melbourne Australia