Hi Michael
I assume you refer to 100% width of the browser?
The Skylar template content width is defined by a single wrapper that wraps all the modules and the component area. For this reason you can only set all content to a width of 100% and not on individual module blocks.
To do so you can add the following to the Custom CSS field of your templates parameters (Extensions -> Templates -> [YourTemplateStyle] -> Custom CSS)....
.content_wrapper.wrapper960 {
width: 100%;
}
Ciaran