Depending on how the background was added to the master Rae's solution may or
may not work (If its done with format > background on the master it won't!)
Try this: If your text is light give the text box a black fill and set
transparency to about 25% in more fill colors. This way the backround is
visible but won't interfere. For dark text try a semi transparent white fill
or maybe just experiment with other colors)
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