Member Profile Modifications Form used in sidebar

I am using the shortcode to put the Member Profile Modification form in a sidebar that is 240px wide. The field names such as phone number, etc. run the width of the sidebar but the fields do not. They are about 150px wide. See link here. http://graphichome.com/art/profile_form.png

Where is the field length controlled so that it runs the width of the area it is placed?
Thank you, Carl

https://wordpress.org/plugins/s2member/