Wiki/ embedded Iframe question.

I have embedded a splash navigation to a wiki I am a content administrator for. My question is how can I edit the hymn within the article content section (where the Iframe html embedding is housed) to expand full screen even over the main content like the header and sidebar? I would put in examples but my site is https.

I'm running mediawiki 1.24.3 with scriubento, parser functions extensions and Java/ raw html enabled. CSS, Java, or HTML solutions are welcome.

Thanks!

Epic visual tool

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