Help Needed to Edit Banner

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I’m currently working on a site that was previously developed by someone else, and I’m having trouble finding where to modify the purple “Free Mattress Protector” shown in the link below. Could anyone point me in the right direction?

Here’s the link to the product page for reference, make sure to navigate to the mattress products to see the banner.
https://ayamattress.com/products/the-oslo
Password: mysocial

Thanks in advance for your help!