Add transparency to color choices for check box line and fill
Sometimes I already have an underlying form in use (one that has check boxes) that I want to make fillable. Since the form already has check boxes, when I add a check box using Prepare Form, the borders can look chunky if I don't get the edges perfectly aligned. Making the fill and line transparent will still fill my underlying check box (part of the form design) but won't try to add a new box overlay.
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And if you can share the sample PDF for us to debug further.