margin: ***; Browser The margin property sets the margins around an element. The margins inside the iframe can be set by applying this property to the BODY element. body { margin: 20px; } Property Value Explanation margin length, %, or auto the top, bottom, left, and right margins Unit of length box margin Example The page that sets the iframe <html> <head> <title>TAG index</title> <style type="text/css"> iframe { width: 300px; height: 150px; } </style> </head> <body> <p><iframe src="example.html">Alternate content</iframe></p> </body> </html> The page to load into the iframe (example.html) <html> <head> <title>TAG index</title> <style type="text/css"> body { margin: 0 40px; padding: 0; background-color: #ffffff; text-align: center; color: #000000; } </style> </head> <body> <p>This is example text ...</p> <p>IFRAME</p> ... </body> </html> Output Alternate content