Testing websites across the myriad of platforms and browsers can be a challenging moment in the path to launching a developed site. There are some good routes for testing CSS, I use Adobe BrowserLab quite a bit.
For testing on iPhones and iPads, the best route is iOS Simulator. It’s an application that comes with the iOS SDK (combo platter for developers on Apple based platforms). It’s like having an iPad for an application – and it has all the functionality as well. (Complete with no Flash support.)
Here’s a screenshot of the site on the iOS Simulator.