System Message display issue

I notice whenever a system message pops up, there is a slight issue with a white background showing. See screenshot link - https://prnt.sc/rCyeknF9ARsD

How can I get system message to align properly on background?
See demo site at - https://www.starentawards.com. To view a system Error message, click on "Show Me How" button in lightbox on home page.

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