How to replace default 404 error pages in iframes with white page?

Ad Slayer

New Member
Hello,

In web pages, whenever an iframe includes a page that is blocked, it displays a default green Android 404 error page. How can I replace default 404 error pages in iframes with a white page? This is to make the page cleaner instead of displaying a green android robot in the middle of the web page.
Thank you :)
 
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