You can expand the width of the article width and hide rail by the following CSS:
/*Expand width*/ #WikiaMainContent { width: 100%; } /*Hides Wiki Rail*/ #WikiaRail {display:none}
However, this is likely to be a violation of the customization policy, so it can be used as personal, only.
You can hide them with scripts for personal use, but they do just that: hide. They do not remove the entire right rail, or increase the width of the body text.