Change Background Color of Survey Half Way Through?

Hi Sawtooth Forum,
I am coding a survey in Sawtooth 7. I am essentially coding two written surveys in one Sawtooth Survey. To make it obvious to the participant that they are transitioning to the second survey, I want to change the background color of the survey once the taker gets to the first page of questions for the second survey. Is there a way to do this?

Thank you!
Elise

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