Fields not contained in IE

http://iamsinc.com/blog/november-2012-life-annuity-academy-application/

In IE7 and older, the fields on the form spill over: http://imgur.com/iW7tU

I've tried using

.gf_browser_ie7 #gform_wrapper_16 #gform_16.gf_center .gform_body ul {
width:750px !important;
}

and

.gf_browser_ie7 #gform_wrapper_16 #gform_16.gf_center .gform_body ul#gform_fields_16 {
width:750px !important;
}

to contain them with no luck. Any other ideas? Thanks!