gistfile1.css

/* Grid css used to look like this */
#yui-main,
.yui-g .yui-u .yui-g {
	width: 100%;
}

/* I made this change to resolve the issue */
#yui-main,
.yui-g .yui-u .yui-g,
.yui-gc .yui-u .yui-g {
	width: 100%;
}