Can I grey out the Next button?

I'm using this process to restrict the learner's ability to move to the next slide until the audio has completed:

https://www.articulate.com/support/storyline/how-to-disable-the-next-button-until-users-finish-interacting-with-a-slide

Now the client is asking that the Next button be greyed out as well. How would I do that (in addition to the process in the link above)?

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