If your html code is from a third party provider, then you need to be going back to their own support for help with this, which in your case it looks to be Admarz.
Wix does not provide support for code provided by third parties that it has not had the chance to test it works etc.
https://support.wix.com/en/article/using-iframes-to-display-visible-content-on-your-site
***We cannot provide support for external codes that were not created or tested with Wix. If you are experiencing an issue with your code snippet, please contact the provider directly. ***