Closed Captioning on IOS

I am working on some discovery around closed captioning in SL360 for our modules. I figured out how to format it using JS. The system works great in general. However, on an iphone7+ the formatting is strange. It is super big and takes up half the stage. Anybody worked with CC on an iphone? I am thinking I can using a JS trigger with an IOS sniffer to change the formatting when viewed on an iphone. Wondering if there is something I am missing in the player settings?

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