How can we remove white space inside Ifram?

For removing white space inside Ifram in html just write down style in Ifram Tag.
Like style="margin:0px; padding:0px;"

<iframe class="imagebox" src="test.html" frameborder="0" width="334" scrolling="no" height="150" color="#ff0000" style="margin:0px; padding:0px;"></iframe>