Modify the Width of Sidebar Login Plugin

What is the minimum required width of the sidebar to accomodate the Sidebar Login plugin? It looks like about 180px.

Also, how might I adjust the width of the Sidebar Login Plugin? I did not see any obvious table cell or other width parameters in the code (I’m a reasonably proficient coder, though new to php). I would like to see if I could get the plugin to work in a 150px-wide right sidebar. I can increase the width of the sidebar, however, it would be nice to have the option of making the plugin narrower, if possible.

Any help with this would be appreciated.

Thanks!