.tooltip {
  color: #222; 
  background: #fff; 
  padding: .5em; 
  text-shadow: #f5f5f5 0 1px 0;
  border-radius: 2px; 
  box-shadow: 0px 0px 2px 0px #a6a6a6; 
  opacity: 0.9; 
  position: absolute;
  font-size: 14px;
  font-family: sans-serif;
  font-weight: normal;
  vertical-align: middle;
}