Remove iframe border with CSS

So how do I do it? It seems the following code

iframe {
border: 0px solid #ffffff;
}

works in Firefox, but not in IE.

Also I know how to do it with HTML, but I want a CSS way. If it's not possible, please also inform me as well.

Please help!

 

Unfortunately afaik the only way is to use the (deprecated?) frameborder attribute and set it to 0.