[Plugin: Site Layout Customizer] Thick line below a layout

The only problem I have with this nice plugin is that it steals a thin line from the footer of my theme and places a thick line at the end of each layout. Here is a page I am working on, which shows this problem: http://goo.gl/Srg5O Could anyone please suggest any ideas how to solve it?

http://wordpress.org/extend/plugins/site-layout-customizer/