Welcome to Shopify Community. My name is Olivia and I work here.
Thanks for sharing your question with our network. While our Support team may not be able to assist with your custom page on a third-party theme, I wanted to reach out and invite you to share more details for other community members that come across this thread.
Make sure to include the following information to your post:
This way we can ensure that devs in our forums have the information they need to properly offer any advice.