@GatewayServies By 'host pages,' do you mean Unbounce pages? If so, it's not possible. You must add the code directly inside the Unbounce page. If you have access, let me know, and I can share the code to remove them. Thanks!

I have access to unbounce pages - this is where I am createing all the pop ups.

They are being triggered from another website which I do not have access to. 

If you can let me know how to remove the ‘x’ from the pop up window that would be super helpful

@GatewayServies So you want to remove this cross mark from the popup, right?: 
 

yes exactly - I have made the CTA for button at the bottom to say close  - this way person reads whats on the pop up and then closes it

@GatewayServices Initially, I checked, and it didn’t work from the builder. The code doesn’t work primarily. We need to apply the code on the page where the popup will appear. Do you have a chance to get access to that external site?

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Thanks for looking into it, I was trying to avoid contacting the host but if thats the only way I found a solution on our forums: 

you can remove the close button with a bit of CSS placed on the host page the pop up is set to fire on:

 .ub-emb-iframe-wrapper .ub-emb-close {
  	visibility: hidden;
  }