arangodb/js/apps/system/aardvark/frontend/css/dbSelectionView.css

span.selectDB {
  top: 6px;
  left: 210px;
  position: absolute;
}

span.selectDB > select {
  line-height: 20px;
  height: 20px;
  width: 150px;
  padding: 0px;
}