You should find something you need [here or [URL="http://www.hongkiat.com/blog/responsive-web-tutorials/"]here or [URL="http://responsivedesignweekly.com/rwd-summit/responsive-layouts-with-zoe-gillenwater/"]here](http://designwoop.com/2012/03/15-detailed-responsive-web-design-tutorials/).
The basis of a fully fluid site involve using media queries to change the layout when it no longer fits the viewport. There are many strategies but a common theme would be [mobile first and then expand for more capable devices. It is not just a case of adding a simple rules set to the body tag but a whole [URL="http://mobile.smashingmagazine.com/2012/10/24/beyond-common-media-query-breakpoints/"]design concept](http://www.slideshare.net/bryanrieger/rethinking-the-mobile-web-by-yiibu) from the ground up.
This site for example shows very good both on desktop and mobile devices
I didn't see anything special there apart form a media query to scale up for larger viewports. The iphone emulator shows the site just shrunk to fit with no special rules that I could see (I assume the actual iphone would be the same but have;t got one to hand to test). If the site is 960px wide then it gets scaled to fit the iphone better but a better approach would be a change of layout for small devices and not just a shrunk layout with unreadable text.