[TheLastSuperman]

Hmm try editing the shade color {vb:stylevar shade_color}

However you have a dark style so more than likely you have the shade set to black or a color to make it seem like a glow either way you might need to edit the css, edit the templates and find the css template popupmenu.css

.popupbody li input.searchbox {
	width:180px;
	padding:{vb:stylevar popup_padding}px;
	font-size:10pt;
	font-style:italic;
	color:{vb:stylevar shade_color};
}

.popupbody li input.searchbox:focus {
	font-style:normal;
	color:{vb:stylevar body_color};
}

Change color:VALUE to suit your needs.