Mathematica notebooks can be made into Computable Document Format (CDF) documents. CDF documents that are embedded into a web page appear as gray boxes when they contain potentially unsafe dynamic content. This is a security feature that prevents potential malicious code from being run.
If the CDF document is embedded in full screen mode, it shows a button that allows a viewer to run the document’s content. To embed the CDF document in full screen mode, use the following code in the web page: