When I view my pages in IWP, it cuts off a lot of the data in the fields. I looked and saw that all the fields are at absolute positions, so I don't think a CSS is going to fix this. Some of the problems are small, it cuts off the bottom 10 percent of the radio buttons. But in some cases,there are whole lines of text that are underneath the next question. In one case, 4 of the 6 radio button selections are hidden under the next question.

How can I fix this?

The IWP reference guide explains the limitations of IWP. In general it says you should design to the IWP standards.

In your instance you must make the fields large enough to accommodate web rendering methods. I typically apply an extra couple of pixels depth on each field. Font choices are also a consideration if you use fonts in development that are not available on the web client machine.