Lightbox Slide Size

Is there a way to define a custom size for a lightbox slide that is different than the file page size?  My Storyline file page size is 900X506.  I am using a lightbox slide to display an Engage glossary as a web object.  I'd like to make the lightbox slide "taller" (e.g. 900X700) so that the glossary window is not cut off and scrolling to see the bottom of the listings.  Thanks in advance for any help.

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