How to Make Container Width Responsive to Floating Elements Inside

[Raraguave]

I'm a student making a website for my assignment and I'm working on a contact form as seen here:http://www.brightpixelstudios.co.uk/contact/I'm trying to get the border surrounding the contact form to take up only the width necessary and not 100% of its parent container. The container has floating elements inside it, would this be what's causing the problem?Is there any work around I could try?Thanks in advance,Will Whitehead