piwigo/plugins/language_switch/default.css

#languageSwitchBox {
	padding: 0.5em 5px;
	border-radius: 4px;
	z-index: 100;
	text-align:left;
	display: none;
	position: absolute;
	left: 0; top: 0; /*left, right set through js*/
}

#languageSwitchBox .switchBoxTitle {
  padding-bottom:5px;
  margin-bottom:5px;
}