It is you answer:
How to apply CSS to iframe?
Edit: This does not work cross domain.
There are two different things here: the style of the iframe block and
  the style of the page embedded in the iframe. You can set the style of
  the iframe block the usual way:
<iframe name='iframe1' id="iframe1" src="empty.htm" 
        frameborder="0" border="0" cellspacing="0"
        style="border-style: none;width: 100%; height: 120px;"></iframe>
The style of the page embedded in the iframe must be either set by
  including it in the child page:
<link type="text/css" rel="Stylesheet" href="Style/simple.css" />
Or it can be loaded from the parent page with Javascript:
var cssLink = document.createElement("link") 
cssLink.href = "style.css"; 
cssLink.rel = "stylesheet"; 
cssLink.type = "text/css"; 
frames['frame1'].document.body.appendChild(cssLink);