How to control the width of an apex inputfield in a VisualForce Page

Question

Since the standard Page Layouts don't allow you to adjust the width of an inputfield bound to a text field, I'm trying to create a VisualForce Page but there isn't a width attribute for the apex:inputfield component. I think I will have to use styles or CSS or something, but I don't know how.

What do I need to do to adjust the width of a text inputfield?

Please provide instructions using the web interface (not Force.com IDE). Thanks.

EDIT

I ended up using an embedded style like this

<apex:inputfield value="{!Country__c.Full_Name__c}" style="width:400px"/>