Resize page contents to fit on one print page

This problem IMO is more related to CSS but I am open to any solution. I am trying to print a webpage who's height is defined in px (I also tried %). Now What's happening in Safari and IE 8 and onwards, page contents will not print on one page.

Current Setup

div.parent-container{  
    height: 900px;  
}  

div.parent-container div.child-containers{  
    height:100%;  
} 

What's happening

It will print everything on one page in FF but in IE and Safari contents will split in to two pages which is heck of a problem for my users. I have to tell them to set page-margins: 0.3 which is definitely not an efficient way.

What I have done

I have tried different @page and browser specific hacks to make it work but it doesn't prove to be fruitful OR doesn't seem efficient to me( Never been a fan of customized browser hacks).

What I want

CSS/JS solution to make page contents print on one page may be something like 'Shrink to Fit'.

Thanks, Rahi