MediaWiki:Vector.css

/* CSS placed here will affect users of the Vector skin */

/* force the display of the contents of the section */
#p-googleadsense  .body {
	display:block !important;
}
/* Option 1: hide the header */
#p-googleadsense h3 {
	display:block;
}
/* Option 2: just hide the arrow in the header */
#p-googleadsense h3 {
	background:none !important;
}